Minor fixes.

Removed two headers prelabel example due to 

http://savannah.cern.ch/bugs/?102340

Documentation/ProgrammersManual.tex

@@ -358,15 +358,15 @@ The SCSI commands and st driver's functions used in previous software (CAStor's
     \item Log select (for clearing compression stats page. The function clear\_compression\_stats
           actually does a blanket reset of all statistics. It sets the PCR/SP/PC combination
           to 1/0/3. The basic SCSI specification states that the value pf PC is not important,
-          but for the IBM drives, the documentation recommends PC=11b, which we have for all drives.
+          but for the T10000 drives, the documentation recommends PC=11b, which we have for all drives.
     \item Log sense, to read the compression pages. This is device dependant. The code covers
           5 blocks of device types: DAT, DLT-SDLT-LTO, IBM(3490, 3590, 3592), StorageTek RedWood(SD3),
           StorageTek(9840, 9940, T10000).
     \item Log sense for page 0x2E (tape alert, as defined in SSC-3) on all modern tape drives to detect tape alerts.
-    \item Mode sense was used in setdens called itself by mounttape. It sets density and compression
-          parameters based on the drive type and the density requested by the caller. On all modern tape drives,
+    \item Mode sense and Mode select was used in setdens called itself by mounttape.
+          They get the drive parameters and set density and compression parameters based
+          on the drive type and the density requested by the caller. On all modern tape drives,
           the compression page is 0x10. This will be replaced by the function \verb#Tape::Drive::setCompressionAndDensity()#.
-          Some work is still needed to fully understand the original function.
   \end{itemize}
 \item st driver's commands, leading to internal variables setting or SCSI actions:
   \begin{itemize}
@@ -472,7 +472,7 @@ and the general description of the ANSI fields can be found in IBM's z/OS docume
 \footnote{ \href{http://publib.boulder.ibm.com/infocenter/zos/v1r12/index.jsp?topic=\%2Fcom.ibm.zos.r12.idam300\%2Flabdef.htm}{http://publib.boulder.ibm.com/infocenter/zos/v1r12/index.jsp?topic=\%2Fcom.ibm.zos.r12.idam300\%2Flabdef.htm} }.
 
 The AUL format consists of volume label, header blocks and trailer blocks. All those
-descriptors are contained in tape blocks of 80 kilobytes. All data is in ASCII nowadays.
+descriptors are contained in tape blocks of 80 bytes. All data is in ASCII nowadays and empty bytes are spaces.
 
 
 \begin{table}[H]
@@ -596,7 +596,7 @@ CAStor example for the second file on the tape:
   0-3 & 4 & 0x00 & Header label: the caracters "HDR2 or EOF2" \\
   \hline
   4 & 1 & 0x04 & Record format. An alphabetic character that indicates the
-  format of the records in the associated data set. For the AUL it could be only: F - fixed length, U - undefined length(only inside PRELABEL with HDR2).\\
+  format of the records in the associated data set. For the AUL it could be only: F - fixed length.\\
   \hline
   5-9 & 5 & 0x05 & Block length in bytes (maximum).  For the block size  greater than 100000 the value is 00000. \\
   \hline
@@ -689,29 +689,6 @@ CAStor example for the empty tape with PRELABEL and one HDR1 is used:
 \end{small}
 \end{minipage}
 
-\begin{minipage}{\linewidth}
-CAStor example for the empty tape with PRELABEL and two HDR1 and HDR2 are used:
-\begin{small}
-\begin{verbatim}
-00000000  56 4f 4c 31 56 35 32 30  30 31 20 20 20 20 20 20  |VOL1V52001      |
-00000010  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
-00000020  20 20 20 20 20 72 6f 6f  74 20 20 20 20 20 20 20  |     root       |
-00000030  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
-00000040  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 33  |               3|
-00000050  48 44 52 31 50 52 45 4c  41 42 45 4c 20 20 20 20  |HDR1PRELABEL    |
-00000060  20 20 20 20 20 56 35 32  30 30 31 30 30 30 31 30  |     V5200100010|
-00000070  30 30 31 30 30 30 31 30  30 30 31 33 32 33 34 30  |0010001000132340|
-00000080  31 33 32 33 34 20 30 30  30 30 30 30 43 41 53 54  |13234 000000CAST|
-00000090  4f 52 20 32 2e 31 2e 31  33 20 20 20 20 20 20 20  |OR 2.1.13       |
-000000a0  48 44 52 32 55 33 32 37  36 30 30 30 30 30 30 20  |HDR2U3276000000 |
-000000b0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
-000000c0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
-000000d0  20 20 30 30 20 20 20 20  20 20 20 20 20 20 20 20  |  00            |
-000000e0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
-\end{verbatim}
-\end{small}
-\end{minipage}
-
 \subsubsection{File block management}
 
 Some files tapes have mixed block sizes,