Merge branch 'nd/config-split'

Split Documentation/config.txt for easier maintenance. * nd/config-split: config.txt: move submodule part out to a separate file config.txt: move sequence.editor out of "core" part config.txt: move sendemail part out to a separate file config.txt: move receive part out to a separate file config.txt: move push part out to a separate file config.txt: move pull part out to a separate file config.txt: move gui part out to a separate file config.txt: move gitcvs part out to a separate file config.txt: move format part out to a separate file config.txt: move fetch part out to a separate file config.txt: follow camelCase naming