In brief : adding possibility to use log messages like "#123 : new feature" in Hamster

Hi, 

This is a quite big pull request, but ideas and code artilation are the same. I renamed some variables to make program reading more clear (I hope !).

The main goals were :
- more output to user : I wanted to see what was hapening
- keep my Hamster history : I log time in Hamster in that format : "#[ID] : [comment]"; where ID is the corresponding Redmine issue ID. Now users can log things like "Working on #233", "#233 : adding some stuff" ... see the regexp in config file

Hope you'll understand my goals.

Thanks
Bruno