Merge pull request progit#1314 from phil-blain/short-help-option

Getting Help: fix inconsistency with '-h' option

[images] Last fixes to svg images

Some arrows were still reverted..

Merge pull request progit#1307 from phil-blain/964-clear-up-working-o…

…n-a-submodule

Add cd commands to clarify "Working on a submodule" section

git_repository_set_odb call needs repo as input (progit#1305)

git_repository_set_odb call needs repo as input

Merge pull request progit#1302 from phil-blain/submodules-details

Add practical details about submodules usage

Merge pull request progit#1298 from aollier/gnu-rcs-link

Added link to GNU RCS

preventing SSH port forwarding (progit#1296)

preventing SSH port forwarding

Merge pull request progit#1295 from max123kl/new_svg2

SVG images checked and fixed (some redesigned)

Merge pull request progit#1287 from progit/export-sketch-symbols

Add a slice to the symbols page and export it

Update diagram font and export SVGs (progit#1285)

Update diagram font and export SVGs