Merge pull request #202 from JohannesEbke/master

Add a4atlas variables and fix a4plot plotting scripts
a42root: Add keepalive list to prevent the pool being freed
WIP fixing root2a4
a4root: Finish fixing a42root on concatenated files
Merge pull request #203 from JohannesEbke/wip_fix_root2a4

Fix a42root problems on concatenated files
a4io: A4_LOG_LEVEL can now increase the level set by the program
Merge pull request #204 from JohannesEbke/log_level_fix

a4io: A4_LOG_LEVEL can now increase the level set by the program
Add a4atlas a4copy/a4reweight regression tests and salient realworld data
a4copy: add --debug-salient to extract one event per metadata
a4reweight: bugfix if -x parameter is invalid
a4atlas: Add test-data containing only A4Keys and metadata.
Merge pull request #207 from pwaller/a4reweight-bugfix

a4reweight: bugfix if -x parameter is invalid
Merge pull request #206 from pwaller/a4copy-salient

a4copy: add --debug-salient to extract one event per metadata
Merge pull request #205 from pwaller/a4reweight-test

Add a4atlas a4copy/a4reweight regression tests and salient realworld data