Allow HP/MP steal powers to work on the final blow

Closes #777

If an entity is killed with a power that steals HP or MP, a percentage
of that enemy's HP before dying is taken (as opposed to a percentage of
the damage delivered).
Simplify calculating steal_amt
Merge pull request #123 from clintbellanger/master

merge from master
Add Morel Bérenger to the mailmap file
Simplify getVideoModes()

Video modes are now stored in a vector instead of a C-style array. In
addition, we do better checking for duplicate resolutions and explicitly
include the mod-determined minimum resolution now.
Obey MIN_VIEW_W and MIN_VIEW_H when getting video modes
Merge pull request #806 from stefanbeller/mailmap

Add Morel Bérenger to the mailmap file
Merge pull request #807 from dorkster/config

Simplify getVideoModes()
Merge pull request #803 from dorkster/steal_hpmp

Allow HP/MP steal powers to work on the final blow
Fix background tile rendering when animated tiles are off
Merge pull request #808 from dorkster/animated_tiles

Fix background tile rendering when animated tiles are off
enemy convert_status
initialise convert_status
Rename readme file in languages directory to regenerate_po.sh

The packagers of the various linux distributions told us last release,
this text file has warnings as the +x bit is set. To circumvent this
warning for packagers, we'll rename the file to what it actually does.
Add a .gitattributes file

This file can be used to tell git about certain attributes for files.
The current entries basically tell git to exclude files, when generating
the release tar-ball with
	git archive --format=tar.gz master > ../flare_release.tar.gz
Merge pull request #811 from RyanDansie/enemy_convert_set_status

convert_status for enemies
Remove superflous 'last_seen' variable in StatBlock
Merge pull request #815 from stefanbeller/remvar

Remove superflous 'last_seen' variable in StatBlock
Fix positioning for waypoints and wander_area
Merge pull request #814 from stefanbeller/release_preparations

Release preparations: Rename languages/readme and ignore files when creating release tarball