fix #95

some more news
comment kdbos.h
closes #99

the bug #99 was already fixed before, but not closed
also add more docu, refer to hidden plugin
and add one more test
resolver+constants README.md

allow macro usage within README.md
automatically handle README.md with add_plugin
add possibility for #include ELEKTRA_README(myplugin)
document that stuff in tutorial
constants: correctly use keyAddName and not keyAddBaseName
modernize template

use add_plugin
add a plugin test
add README.md for #59
export contract
allow to pass check
add check
improve copy-template
add <kdbhelper.h> in kdbplugins.h to have elektra* methods
fix noresolver readme inclusion
cpp: remove operators modifying name
move keyLock to proposal

(no public usage of it)
say which directory failed sync
add sync plugin

fix ELEKTRA_SET_ERRORF
full coverage of all permutations to test #38
moved keyAddName to proposals