adding infrastructure for variable rec & mut rates
make forest respect rec rate changes
ensure that model is reseted between loci
remove unneeded check
add command line options for rate changes
fix problem in debug code

which occurred when two events happened at the same time. This seems to be
possible with growth and might be introduced by the fastlog/fastexp functions,
but should not be a problem for the production code.
adjust calculation of rec rates
fix wrong assertion
Merge branch 'master' into variable_rec_rates

Conflicts:
	src/param.cc
Merge branch 'variable_rec_rates'
increase version to 0.9.2