Unhide sql-sanitize

As per https://github.com/drush-ops/drush/issues/89#issuecomment-24291299, unhiding sql-sanitize from help.
#48: Fix broken --exclude-other-sites option.
#86: Include database name in confirmation message for sql-drop.
Adds note about how to assign issues.
Add a support section to the README
Add links to old drupal.org issues in README
Move usage section up.
Merge pull request #119 from greg-1-anderson/readme-support

Add a 'Support' section to the README file
Merge pull request #116 from patcon/patch-1

Adds note about how to assign issues.
Merge pull request #90 from jeff-h/patch-1

Unhide sql-sanitize
Fixing cygwin path conversion (See https://drupal.org/node/2036001)
Split table list returned by _drush_sql_get_db_table_list() correctly when on windows.
Exploding the newline-seperated string of table names only on newline characters (\n) leaves all corresponding carriage return (\r) chars behind. confusing all checks performed directly on the array, such as in_array. As e.g "sessions" != "sessions\r", $skip_tables oder $structure_tables will only contain the respective setting's last element.
Add --field-labels option, so that users may omit field labels from command output if they do not want them (e.g. to emit only a single data item with --field=xyzzy --field-labels=0).
Remove dead code from site-install. sqlite doesn't need special handling here as sql-drop already supports sqlite.
Fix #109. drush status's 'PHP configuration' should reflect the setting of the DRUSH_INI environment variable.
#132: Avoid calling pm-updatecode-postupdate in pm-update.
Support 0 in addition to 'no' as value of --sanitize-password|email options.
fix last commit regarding sql-sanitize.
Remove a couple unnecessary comparisons to FALSE
Merge branch 'check-updatedb'