get rid of use of SOFTROOT and SOFTVERSION, clean unused imports in application.py and easyblock.py, fixed small bugs

Conflicts:
	easybuild/easyblocks/i/imkl.py
	easybuild/tools/toolkit.py

Conflicts:
	easybuild/framework/application.py
	easybuild/tools/toolkit.py

merge regtest into develop

Fix merge

fix debug printing

315 regtest rework

specify UMFPACK and CHOLMOD include directories explicitly, with UFconfig dir included (required to find UFconfig.h during UMFPACK/CHOLDMOD tests)

clean up example goalf easyconfig for SuiteSparse, add example easyconfig for ictce, get rid of patch file and patch in easyblock using fileinput, fix creating of symlinks