Niten Ichii Ryuu

Based on purplewisp's JSON on the forums: http://smf.cataclysmdda.com/index.php?topic=8689.0

This currently is available at chargen (melee weapon training) or rarely from dojos; it lets users power-attack at mid-grade skill and work up to knockdowns and counter hits, topping out around skill 6.

Used with katanas, wakizashis, the standard quarterstaff, and the cudgel.  I'm pretty sure the bo (Japanese staff) was not ironshod, and the nodachi is a bit large for this sort of training: not an "inside" weapon.

Balance tweaks are welcome, and I'm prepared to add bokken/shinai, along with a mansion spawn group, if desired.
Adds bokken and crafting recipe

Not much less lethal than a katana (as is the case in reality), compatible with Niten Ichi Ryuu, and wholly nonconductive.  Works well against shockers.  ;-)
Spawns & mansion_book spawn group

Bokkens can now be found in pawnshops & Mansion armor collections.  (They really should be more broadly distributed--sporting goods and/or milsurps--but they're also very good at this point so might throw things out of whack.)

The mansion_book spawn group has some of the rarer books as well as the MA manuals for Fencing and Niten Ichi Ryuu.  It itself is pretty low-occurrence but happens in mansion libraries, ofices, and game rooms so ought to have a pretty decent chance.
Adds manual_niten to the ma_manuals group.
Fixes.
Adds an 'app' target to create an OSX app bundle.
Adds support for copying sound files to bundle. Adds a note to the compilation instructions.
A single string with meaningful name.

From 30 to 32 characters as it aligns with the line below it.
This is (to me) easier on the eyes.

Fixes two comments (improves either correctness or readability).
Removed unnecessary qualification.
Removed stupid if statement.

Bonus
 Proof that if A > B, A - B > 0.
 If A > B, A = B + C (where C is a positive number).
 Rearranging gives A - B = C > 0, therefore A - B > 0.
Merge remote-tracking branches 'dda/pr/10649', 'dda/pr/10671' and 'dda/pr/10672' into dda-master

* dda/pr/10649:
  Fixes.
  Adds manual_niten to the ma_manuals group.
  Spawns & mansion_book spawn group
  Adds bokken and crafting recipe
  Niten Ichii Ryuu

* dda/pr/10671:
  Adds support for copying sound files to bundle. Adds a note to the compilation instructions.
  Adds an 'app' target to create an OSX app bundle.

* dda/pr/10672:
  Removed stupid if statement.
  Removed unnecessary qualification.
  A single string with meaningful name.