roverlay/depres, slot rules: "wide match"

In continuation of commit #50bd6d5aac48317c46b777acf9c1836e792bff58,
make the slot match behavior configurable (depending on the slot rule,
not the dep env<-package).
roverlay/depres, rule constructor: accept bool value

The wide_match option accepts a boolean value now:
   wide_match[=[1|y|yes|0|n|no|...]]
doc/rst: document slot deprule changes
roverlay/overlay/rulegen: fix dot handling

for scanned ebuilds: replace underscore chars '_' with dot chars '.' and the
resulting str as package name alias to the dyn. dep rule.
packagerules/generators/addition_control: fix

Cannot compare str to version tuple -- use str on both sides, which means that
the addition control rule generator has to create acceptors with
get_ebuild_version() as value getter and not get_ebuild_version_tuple().
roverlay/overlay/pkgdir/packagedir_base: fix

Clear "replace-only" addition control flag when revbumping.
Otherwise, the revbumped package gets denied.