FIRMA: Removed a piece of nonsensical and archaic debug code from process()

Git blame shows that the i==50 check was there since the very beginning.
It seems it was added once for a specific case to run through with the debugger,
but after that it was never removed again.
OMOUSE: Fixed a spelling error in a comment
ONATIONB: Fixed a bug with Alliance visibility and new nations spawning

When a new nation spawns, it sets its relations with others and others
with it. However, the NationBase member variable is_allied_with_player was
also reset for each already existing nation in init_relation.
is_allied_with_player is used for visibility-checking, and so a new nation
spawning caused all existing alliance-visibility to vanish.
Sys: Fixed pause toggling after loading games

When in a game, then pausing and loading a different game, the
Sys::set_speed function is not in a correct state (because of internal
static variable), causing the pause keys to not function properly.
Added a check to catch this situation and rectify it.
Town Network: initial files and algorithm implementation.

Includes the basic definitions of a Town Network and the TownNetworkArray,
which is to TownNetwork what TownArray is to Town. Extended Town to
include properties pertaining to Town Networks and handle events relevant
to Town Networks.

Updated by Jesse Allen <the3dfxdude@gmail.com> to merge cleanly, and to
update the automake files.
Town Networks: OTOWNDRW: Updated draw & detect of town-to-town migration to use the Town Networks.
Town Network: Fixed typo's in OTownNetwork.cpp, which caused the code to malfunction
Town Network: introduced bug in OTOWNDRW, now fixed again: do not draw migrate icon on source town
Town Network: OTOWNDRW: Added flag to enable drawing lines to all towns in the network, not just to towns directly linked
Town Network: OTOWNDRW: Fix a minor issue with other nation towns and the flag for drawing all lines
Town Networks: OTOWNDRW: Detect as early as possible when the migration towns are off-screen
Town Network: Fixed a bug with transitioning to/from independent towns from/to nation towns
Town Network: Updated saving and loading code for Town Networks, without breaking binary compatibility with the current savegame format.

Town Networks and any information related to them are not saved to file
and during loading are dynamically recreated.
Town Network: Fixed a typo and added/changed two comments
Town Network: Fixed an off-by-one error in recreate_after_load()

This bug caused the last town in the town array to not be considered for a
town network, causing problems later on.
Town Network: Added some robustness for errors for town_created by checking and repairing invalid town network recno's
OTOWNDRW: Use original amount of town link-lines drawing by default (i.e. drawing lines only to directly linked towns)
Town: Reduced MultiPlayer message clutter when migrating 10 peasants at a time
Town: Fixed off-by-one error in migrate_to return value, introduced in the previous commit
Merge branch 'patches-9-12-2013' of https://github.com/MicroVirus/7kaa into MicroVirus-patches-9-12-2013