preferences file with \use_converter_cache true. It is disabled by default,
and no GUI support for changing the preferences is yet implemented.
* src/insets/insetgraphics.C
(InsetGraphics::prepareFile): Use image file cache
* src/insets/ExternalSupport.C
(updateExternal): Use image file cache
* src/exporter.C
(Exporter::Export): Do not use image file cache
* src/graphics/GraphicsCacheItem.C
(CacheItem::Impl::imageConverted): Add the converted file to the
image file cache
(CacheItem::Impl::convertToDisplayFo): Use image file cache
* src/converter.C
(Converters::convert): Use image file cache if the caller allowed that
* src/converter.h
(Converters::convert): Adjust arguments
* src/Makefile.am: Add new files
* src/support/lyxlib.h
(chmod): new function
(copy): add mode argument
* src/support/copy.C
(chmod): new function
(copy): implement mode argument
* src/support/mkdir.C
(lyx::support::mkdir): Add warning if permissions are ignored
* src/lyxrc.[Ch]: Add new settings \converter_cache_maxage and
\use_converter_cache
* src/ConverterCache.[Ch]: New image file cache
* src/importer.C
(Importer::Import): Do nut use the image file cache
* src/lyx_main.C
(LyX::init): Initialize the image file cache
* src/mover.[Ch]
(Mover::do_copy): Add mode argument
(SpecialisedMover::do_copy): ditto
* configure.ac: Check for chmod
* development/cmake/ConfigureChecks.cmake: ditto
* development/cmake/config.h.cmake: ditto
* development/scons/SConstruct: ditto
* development/scons/scons_manifest.py: Add new files
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15897 a592a061-630c-0410-9148-cb99ea01b6c8
