Change the compression library for config ROMs from zlib to lzma/xz (~30% better).
Makefile.ocpi.common: link main programs against our sandboxed lzma library.
core/application/Makefile.ocpi.imports: add lzma library
core/container/hdl/Makefile.ocpi.imports: add lzma library and include dir
core/container/hdl/src/HdlDevice.cxx: use lzma when decompressing config ROM
core/container/hdl/src/SimServer.cxx: improve messages
core/container/hdl/src/ocpihdl_main.cxx: use lzma for bram and unbram commands
env/start.sh: add LZMA environment variable OCPI_LZMA_DIR