previously code was erroneously using tg.bld.path instead of tg.path
so for nested wscript calls the wrong directory was used in search.
added also better error handling with error message if an included
directory does not exist
* protoc: added java support
Modified protoc to support also .proto -> .java generation. the .java file
name generated is not obvious as in C++/Python but follows a couple of rules
that were implemented.
As cxx/python and javaw Tools are quite different the implementation is not
as clean as for cxx/python but is hopefully fine (ie. protoc still uses
sources for input files while javac uses src_dir).
In javaw a small detail was added: a new attribute was added (gencode) that
instructs javac to look for source files also in the build directory. This
are realistically generated code (and .proto -> .java is an example) and
are therefore in the build. Default is false keeping all the previous
behaviour.
* protoc for java enhanchments (protoc version, regex, docs)
In configure stage get protoc version as java naming changes depending on the
version. Implement the version differences between version < 2 and > 2
Improve regex for option catching and implement a mix of them in playground
to verify it.
Add some documentation on how java filenames and paths are generated.
* protoc: build dir with generated code is automatically added, so no need to explicitly use gencode in javac
