add argument ILequal to dbUniquePeptideSet; closes #60
extend verbose output of dbUniquePeptideSet
rename ILequal into IisL
remove default value for IisL argument
fix missedCleavages > 1 for PLGS rule
Revert "remove default value for IisL argument"

This reverts commit 579fb7223140377ae597cd3cfde22715390b0d6f.
change IisL default to FALSE (same behaviour as synapter < 1.7.3)
Merge branch 'removePrecursor' into IL

Conflicts:
	NEWS
add missing IisL argument
Merge pull request #61 from lgatto/IL

add argument ILequal to dbUniquePeptideSet; closes #60