More work on the file explorer. Added file type filtering. Maintains state if user switches to viewer and back.

Change-Id: I75322a9ada9c84faa6c54ade7d44e5493abb418a

Regression from commit 2ad707b3, which only updated the import, but
forgot to remove the fake "in background" property on export.

Change-Id: I2b42c5fa7873d946b10d311800049586bc214071

Change-Id: Iddbc17e79a35ceb39eb8abfcb3a820f30961a54d

Change-Id: I11c45830f6a322876041f6beda9e31fde110a2a7

Change-Id: Iaca5b31fb723e158198c7a21c1361f3f4a756477

Change-Id: I3e4387ba5414aee7108e8a471d964baaece2c0a0

Change-Id: I94b074d7d2e1ea2f80c3075ae49530225947442d

Change-Id: I7f923a5622214f7540a789bcdd93bf6fd1d166db

Change-Id: I97491c61ef83f947e1923785300490f3b7920203

Change-Id: Ic64e3e527ced7fcf81f90075bae7d8a646789d4e

Change-Id: I8ab65f917e9442f8871a39d7d25a63336065bee6

Change-Id: If693eea8deceec7eebd45ab04de020223dc7f6a7

...the mangled names of the corresponding symbols change with MSVC if you change
a member from public to protected.  This had been changed with
6e67c03d "Enable -Wnon-virtual-dtor for GCC 4.6"
but should only be necessary for GCC, not for MSVC, so can simply be reverted
under _MSC_VER.

Change-Id: Id22aadaff3d7f30ed824f39fe22eab7ca39bd408

Change-Id: I01a9118d22ee88b7011ae8b8028b11e043f8c52e

Change-Id: I17db9db426b10e0cb2148b33dfc9631ea9cb81a4

otherwise breaks with comparison beetween signed and unsigned integer
expressions

Change-Id: I86c06fc3f7dcd0a24898a602a60c10abdc588b81

Change-Id: Ib15db39659faae398ae3d33f01886c43c0a3b507

Change-Id: I9df71fd2db17cda15a19b41b0ff389bc2e49eecc

 - frame.hxx: git grep shows that variable is not used anywhere
 - dflyobj.hxx, frmtool.hxx: redundant visibility declaration
 - layouter.hxx: redundant include (once with "" and once with <>)

Change-Id: I4a31c215d70e6f8f8fc8a768851315b919fba03e

Change-Id: I5abe2119ddadf7f44ebe711efe30e33491362c3d

+ added lt_db_set_datadir() and lb_db_get_datadir() functions to point to
  liblangtag data and override REGDATADIR define
- removed LIBO_LANGTAG_DATADIR environment variable hack

...it is done in UniString(rtl::OUString const&) ctor anyway

Change-Id: I890ab21a6c04fe0ddc0a9b2c9a356359984e516e

XCode 2.5 only has ancient bison that doesn't support the %file-prefix,
%name-prefix,... directives. So use the more compatible commandline
arguments (just like before gbuildification of the module)

...that are not intended to be short after all; just the length
calculation turned out to be wrong.

Change-Id: Ic3a81c935161564f980ddd0241575fff2f76b467

This is the first part of a nice cleanup ;)

Change-Id: I2fa632dbb589053d8f95456233e10e97dff190fa

Change-Id: I062179fca29034602ffc18ad7e2b7de2988dac2f