Missing file format bis from 0c3b88e3
Support new languages in tex2lyx

I forgot that this was part of the file format update as well.
Also fix a mixup of "english" and "uppersorbian".
Fix make check.
Fix import of latex documents with scaled fonts.
Fix scale parameter for fonts.

When a font is scaled by a certain percentage in the document settings,
LyX was outputting a ridiculous parameter value. For example, if the
font is scaled 90%, the corresponding parameter was "scaled=0.899999976".
The patch avoids this and, in the previous case, one gets "scaled=0.9".
This is not only cosmetic, because in roundtrip conversions the parameter
would be continuosly changing.

This commit and b60b505f should be backported to the 2.1.x branch, where
reimporting with tex2lyx an exported document produces wrong results
(also in version 2.1.0).
Fix compatibility issue with 64-bit cygwin.