Added support for reflecting Dottable.lookupFeature().
Added support for reflecting Callables.
Fixed a warning emitted by the clang compiler.
Removed interfaces {Integer,Float,Boolean}Value.

Now that we have a very powerful and versatile mechanism to
convert back and forth between Oz values and C++ values, these
interfaces are not needed anymore.
Added reflective calls for the Numeric interface.
Major review of Strings and ByteStrings.
Fixed compat issue: {IsName true/false/unit} must be return true.
Improved dependency management in the build.

The two passes of source generation (first data types and
interfaces, then builtins) have been merged under a single
add_custom_command.

Apparently, this fixes the bad dependency management that forced
to recompile everything every time, in some setups.
Updated the README.
merge
Merge branch 'master' of git://github.com/mozart/mozart2-vm
Use VirtualByteStrings in OS.oz.

But tolerate VirtualStrings in compat functions.
Added functions to get a VS as a new LString.
Added builtin Float.toInt.
Raise the proper error record on illegal feature selection.
Simpler implementation of getIntToStrBufferSize().
Fixed error raising in boostenv.
Fixed build failure with clang.
Improved build scripts for easier setup of a MinGW build env.
Implemented OS.exec and OS.pipe (the latter on Unix only).

This is a rather raw implementation that could use a review.
Added the builtin OS.putEnv.