Make mysql.info optional.

prefers to take docs directly from the source tree.

correct location.

While here:

 - split INSTALL_*DIR variables into two sections, first set the major
   variables, then second set the minor ones, using the major where
   appropriate.

 - format the settings for easier parsing (at least with a wide terminal)

A variable declaration was preceded by "DBUG_PRINT()".

extracted from a work-in-progress development branch
just for the build of 5.5.3-m3.

The "cmake" way still shows issues in our release build environment.
Block it temporarily, but in a way that can easily be undone.

This change is to be reverted once the problems are solved.

There are two issues fixed here:

  1. We needed to update the result file, for some of 
     mysqlbinlog_* tests, because now the some padding chars
     are not output anymore.

  2. We needed to change the Field_string::pack so that
     for BINARY types the padding chars are not packed 
     (lengthsp will return full length for these types).

The problem is introduced by WL#4435 "Support OUT-parameters in 
prepared statements".
When a statement that has out parameters was reprepared,
the reprepare request error was ignored, and an
attempt to send out parameters to the client was made.

Since the out parameter list was not initialized in case
of an error, this attempt led to a crash.

Don't try to send out parameters to the client
if an error occurred in statement execution.

- Fixing crash on attempt to create a fulltext index with an utf8mb4 column
- fixing wrong border width  for supplementary characters in mysql client:

  mysql --default-character-set=utf8mb4 -e "select concat(_utf32 0x20000,'a')"

Split rpl_row_charset into:

  - rpl_row_utf16.
  - rpl_row_utf32.

This way these tests can run independently if server supports
either one of the charsets but not both.

Cleaned up rpl_row_utf32 which had a spurious instruction:
-- let $reset_slave_type_conversions= 0