Update of non-stationary simulation function, creation of manual entry, adjustment of description file, update to new version 1.5

- remove seed
- reset user settings to previous settings: oldpar

remove examples that take too long to run with donttest.

(1) remove unnecessary linebreaks in description file
(2) update reference citation format
(3) comment out unexecutable code in man/fun_stoch_sim_wave.Rd
(4) replace \dontrun with \donttest
(5) reset par to par(mfrow = c(1,2)) at the end of demos or man files
(6) add contribution of R Core Team to description file ks_test.c

# Conflicts:
#	PRSim/DESCRIPTION

Newstructure

See merge request !1