Added the function simulate.tdep.generic.R, for simulation of rates under any time dependent function desired.
Merge to add a new function, this may be disastrous!!
Merge branch 'master' of https://github.com/sebastianduchene/NELSI

ch.
Fixed generic tdep so that it is correct!
Fixed conflicts
Merge branch 'testing' of https://github.com/sebastianduchene/NELSI
Merge branch 'testing' of https://github.com/sebastianduchene/NELSI
added simulate.tdep.ho
Merge branch 'testing' of https://github.com/sebastianduchene/NELSI