IPSPs which are too far away should now be separated - not always
working
problem with distances between ipsps is now removed ('spw_start' was not
changed properly)
too close ipsps are merged
corrected error with removing single IPSPs (found only in one electrode)
added rise - if rise does not exist after the first ipsp of the spw,
then this ipsp will be separated from the spw
added function on removing SPWs which have too few IPSPs
minor corrections