Add missing slash in project url (help->about)
Use proper variable declaration for PicsDir
Disable Look for update if downloads.txt not found

Packaged versions of the software shouldn't contain this
file, which will disable the option altogether.

Users of a packaged version of password gorilla shouldn't
be able to use the software's internal update mechanism.
They should rely on their distro's package manager instead.
Add gitignore file to project
Improve rebuild-msg-files script

- Add cli arguments
  ./rebuild-msg-files [-f] [lang]
    [-f]: modify db files in place
    [lang]: only rebuild lang
- Allow calls from outside utilities/
Correct the GUI translation file for French
Add some missing calls to mc
Fix file permissions on non-executable types

Only tcl/shell scripts with an actual entry point should have
executable permissions set.

This avoids extra steps during packaging to fix those
permissions.
Merge branch 'pre1537-fr_improved' of https://github.com/ajraymond/gorilla into pre1537
Merge branch 'pre1537-minorfixes2' of https://github.com/ajraymond/gorilla into pre1537