New script to prepare ADOdb bundle

This script will prepare the ADOdb library, as extracted from the
upstream release tarball, to be bundled with MantisBT.

The following operations are performed:
 - Removing unnecessary dirs and files
 - Converting line endings to Unix format (CRLF ==> CR)
 - Removing trailing whitespace
Revised adodb-bundle.sh to work inside of a git repository

Exclude git system files and folders from the list of processed files to
avoid corruption of the repository when removing trailing whitespace.