added Ian Documentation Tasks
testcase for wrong ordering
remove unused variable
fix broken build

add ADD_HEADERS within LibAddPlugin
use ADD_HEADERS for static module (need better approach for such helper
modules)
add add_plugin_helper and way to change -fPIC
Fixed a bug in the compilation variant handling causing the conflict debug option to be always enabled
Fixed a bug causing compilation variants to be installed with the wrong name
add tutorial of compilation variants
do not exclude elektra* functions from being documented
Merge branch 'master' into compilation-variant-fixes
remove unecessary includes

- add_headers already does that
Merge branch 'compilation-variant-fixes'
add cmp benchmark for #38
Implemented a remount command for remounting a backend with a different filename
and restructured the mount command to share a common code base
Implemented the mount resolver option
Added a test for the remount command
The umount command now also accepts a mountpath as argument