module file reading/writing

[Dalibor Topic]

Hi,

I've pushed an initial implementation of the reader/writer code
for the module format specified in [1].

It adds a new 'jmod' verb to jpkg. So if you'd want to turn a 'hello'
module at version 0.1 on disk into a jmod file, you'd do this:

jpkg -m hello jmod hello

and get a hello at 0.1.jmod file.

If the module has resources, etc you can tell jpkg about the
directories to add to a module using:

-r dir for resources
--natlib dir for native libraries
--natcmd dir for native commands
--config dir for configuration data

In addition you can specify a directory to create the jmod file
into using -d dir option.

Within each module file section, regular files are gzipped, while
classes are pack200 compressed.

In order to extract a jmod file, you can use the jmod tool, for
example

jmod extract hello at 0.1.jmod

will extract the module file into the 'hello' directory. Sections
other then classes are extracted into subdirectories.

There is an initial set of module format tests, with more to come,
as I hack on improving the code. Please try it out, and tell me
if it works, breaks, etc.

cheers,
dalibor topic

[1] http://cr.openjdk.java.net/~mr/jigsaw/notes/module-file-format/
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