Small fix in pom_editor.sh

cmp returns non-zero value if the files differ. rpm doesn't like non-zero return values
Remove TODO item: "fix pom_editor.sh breaking pom_ macros"

this should be fixed in 718d74b8
Add TODO for maven_depmap.py and extensions containing dots
[man] Bug in %pom_add_dep was fixed
Refresh plugin metadata from central