Update augeas to use add_plugin
Update xmltool to use add_plugin
todo for rename plugin
Update ini plugin to use add_plugin
partly revert a07ad554fca82dc2e599a59fd86abcc4fa6d8e34

fix testdata in nickel tests that might do in-source modifications
add script to mount all kde files

(some special constructs of kde config might fail though)
fix metaset+improve error/warnings

- add two new error/warnings information: mountpoint and configfile
- use signed release tags
- fix error plugin: now use on_open/trigger_warnings to be consistent
- fix metaset: now correctly append new key
-0 option in kdb

- C++ I/O for key(s) now allows null-terminator
- -0 option accepted
- -123 options for hiding nth column in "kdb mount"
- hide warnings during script usage of "kdb mount"
do not create tag when creating source-package
some updates in the todos
improve README

nicer formatting in NEWS
some changes in todos
use links everywhere
allow to remove plugins/bindings/tools

with -element syntax
+ use it in configure-debian
fix cmake messages

-- -> STATUS
will be print to stdout and not stderr
does not disturb ncurses
kdb now uses KDB itself

fix long help text in `kdb check`

add kdb configure options:
/sw/kdb/current/resolver .. want a different default resolver than was compiled in?
/sw/kdb/current/format .. annoyed by dump-default format
/sw/kdb/current/plugins .. if you always forget to add some plugins
fix BINDINGS in script
make loading of kdb less invasive

(broken plugins somewhere in the KDB yielded an exception)
fixes #136

allow to add SHARED_SOURCES
+ improve docu of add_plugin
some basic testcases for resolver variants
allow slashes in relative pathes