Fix lost+found directory name.

For example, 2014111 could be 11-1 or 1-11...
Add more asserts and avoid float round off errors.

Trying to catch the reason why (another assert fires because)
mActivationTimestamp became larger than mAnimTime.

Since the motion clocks must be quantized often, I'm
inclined to use integers for them and not floats...
that would solve the floating point round off errors :p.

One could just store the timestep value in miliseconds,
and mAnimTime and derived motion clock values as integer
factors thereof. Since timestep then would never be
large than 250, the product would always fit in an U32.
It would be faster too of course (integer arithmetic).
Removed erroneous double quote.
Support texture delta for lossless/lossy + other changes.

Well, at least this showed me that changing the hash
algorithm isn't a problem. I added a database "version"
to allow us to enforce a database repair when ever a
hash changes again, which then automatically updates the
whole database with recalculated hash values.

I'm happy that I wrote the extra data (that I called 'Delta's)
on top of a BVH file that is needed to generate the asset
file (J2C) in an object oriented way, even though it was
the only one of its kind, because now I could rather easily
extend it to include textures as well. The TextureDelta
exists of only one boolean: lossless or not, but the principle
is the same as for animations (compare the Looping or not
boolean).

What did take me quite some time was to get the UI correct,
that wasn't as generic as it could have been. Most support
now is in LLFloaterNameDesc (the common base class of all
upload preview floaters).

Finally this large commit contains several other fixes and
improvements more or less related to this texture delta stuff.
More or less because they aren't really related but weren't
needed before and now they are :p. For example, support for
reading and writing booleans with AIXML. But also really
unrelated changes like changing <edit> into <singu> were I
added them in the first place and fixing of some typos,
documentation and float xml text.