redefine semantics for software build options (search only, don't generate); added --try-X options that does make EasyBuild try to generate a matching easyconfig file and use it

add support for SHRiMP

additional python packages: Cython, ASE, GPAW, Theano and CVXOPT

python-meep + deps

remove superfluous script change_toolkit.py, replaced by command line options like --toolkit and --amend

Conflicts:
	easybuild/build.py
	easybuild/easyblocks/w/wrf.py
	easybuild/framework/application.py
	easybuild/framework/easyconfig.py

fix pick_version (avoid crashes when no less recent versions are available); take a deep copy of the specifications passed to select_or_generate_ec such that it doesn't get updated on the caller's end; make match check stricter, also take into account parameters that are not set in selected easyconfig; correct updating of toolkit with specified version; mention old version in comment for tweaked parameter values

h5utils and shapely + deps

implement support for using template easyconfig file when no easyconfig for given software name are available; provide a reasonable template easyconfig file

clarify need for unique function, fix generated filename for easyconfig, fix adding new parameters to easyconfig via --amend