Makefile: clean up of the main Makefile and changed build instructions... to align with normal build systems
* Debug mode is now the default (use DEBUG= to disable)
* Dynamic linking is now the default (use FORCE_STATIC=1 for static)
* Removed references to 32-bit compilation (default is $arch)
Fixes matrix checks - looking saner now...- Matrix checks as described in https://github.com/genetics-statistics/GEMMA/issues/72
- introduces -strict switch which will exit on certain conditions
- zero small eigenvalues in EigenDecomp_Zeroed which also checks for negative values
- commented out float versions of functions in lapack.cpp (pre-removal)
- reverted on disabled regression tests (GEMMA shows its previous behaviour now)
