Additionally, fix misc. code style issues

Use a proper switch with breaks.

* Fix leak like behaviour if you load multiple schematics in a loop.

* Cleanup check in for, fixing theoretical out of bounds read if
	Schematic::deserializeFromMts reduced the number of elements
	in m_nodenames. A != check may need an overflow of the counter
	before it hits, if origsize is larger than m_nodenames.size().

* Fix function name passed to errorstream: it was wrong. Also use
	__FUNCTION__ instead of manually using the method name at other
	places in the function.

* Don't shadow the name member in the loop.

This fixes #3935, a regression from 0338c2eb.
An 'optimization' was performed where an index for the VoxelManip being
operated on was mistakenly used for bounds checking within the incorrect
VoxelArea, namely, the area wherein light should be spread.

Fix initialisation of variable 'disp'
Fix a few minor code style issues
Add independent X motion combining 2 prime frequencies

2016-03-27 15:47:01: ERROR[Main]: ServerError: Lua: Runtime error from mod '*builtin*' in callback luaentity_Step(): Node name is not set or is not a string!
2016-03-27 15:47:01: ERROR[Main]: stack traceback:
2016-03-27 15:47:01: ERROR[Main]: 	[C]: in function 'add_node'
2016-03-27 15:47:01: ERROR[Main]: 	/usr/share/minetest/builtin/game/falling.lua:96: in function </usr/share/minetest/builtin/game/falling.lua:43>

Writing an u8 to verbosestream writes a char, not it's numeric value.

This reverts commit 25da0594.

Commit

65c09a96 "Set acceleration only once in falling node"

has made the acceleration being set only once.
But this has introduced a regression.

Fix #3884.

Currently translated at 34.5% (299 of 865 strings)

This is a merger of 2 commits.

Currently translated at 33.7% (292 of 865 strings)

This is a merger of 2 commits.

Currently translated at 93.0% (805 of 865 strings)

This is a merger of 2 commits.

Currently translated at 70.6% (611 of 865 strings)

This is a merger of 2 commits.

Currently translated at 92.4% (800 of 865 strings)

This is a merger of 3 commits.

Currently translated at 34.4% (298 of 865 strings)

This is a merger of 6 commits.

Currently translated at 89.1% (771 of 865 strings)

This is a merger of 2 commits.

Currently translated at 36.6% (317 of 865 strings)

This is a merger of 2 commits.

Currently translated at 51.2% (443 of 865 strings)

This is a merger of 2 commits.

Currently translated at 46.1% (399 of 865 strings)

This is a merger of 3 commits.

Currently translated at 23.2% (201 of 865 strings)

This is a merger of 2 commits.

Currently translated at 47.9% (415 of 865 strings)

Currently translated at 47.9% (415 of 865 strings)

Currently translated at 100.0% (865 of 865 strings)

This is a merger of 2 commits.

Currently translated at 74.9% (648 of 865 strings)

This is a merger of 3 commits.

Currently translated at 54.1% (468 of 865 strings)

Currently translated at 45.3% (392 of 865 strings)

Currently translated at 100.0% (865 of 865 strings)

This is a merger of 3 commits.

Undoubtably this may cause problems later if unchecked.

```
2016-03-22 21:57:52: WARNING[Server]: Assignment to undeclared global "options" inside a function at .../sofar/git/minetest/bin/../builtin/game/chatcommands.lua:862.
```

This allows the player to more easily target and punch connected
nodeboxes, especially if they have a fixed nodebox that is very
small, like technic cabling, or xpanes. Tried it on fences and
my xpane conversion, and happy with the result.

A bool for 'in or under tunnel' was missing
1-node-deep stone ledges were being
replaced with biome surface material

Changes:
  * Fix indentation.
  * Pass strings by const reference.
  * Merge Strfnd and WStrfnd into one class instead of copying them.
  * Remove trailing spaces.
  * Fix variable names.
  * Move to util.
  * Other miscellaneous style fixes.

Exit if cd fails and don't insert '\' in string.