Io: fix dependencies

Add some missing dependencies that can be found when building with
add-ons. Specifically disable add-ons that are known not to work.

Closes #29051.
Closes #26317.
parallel 20140422
docker 0.11.1
docker: update 0.11.1 bottle.

Closes #29059.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
xplanetfx 2.5.27
xplanetfx: update 2.5.27 bottle.

Closes #29058.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
percona-server 5.6.17-65.0
percona-server: update 5.6.17-65.0 bottle.

Closes #29037.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
clang does not support -fno-regmove
silc-client 1.1.10

Closes #29061.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
dub: add head and devel

Also fix version info by maintaining git history.

Closes #28920.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
dub: style changes
PebbleSDK 2.1
pebble-sdk: update 2.1 bottle.

Closes #29062.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
boot2docker 0.8.1

bump version 0.8.1 + sha1 checksum

Closes #29064.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
enchant: make python an optional dependency.
fontforge: make python an optional dependency.
hexchat: make python an optional dependency.
libstfl: make python an optional dependency.
libtorrent-rasterbar: make python optional.