Java.txt: fix wrong method name in code example
Java.txt: remove trailing whitespace
Java.txt: add comment about PixelsType search

This block of code, which specifically locates the PixelsType
corresponding to that of the source image, is lengthy enough to
warrant a descriptive comment and whitespace separation.
Java.txt: fix indentation levels
Java.txt: add comment for image creation step
Java.txt: standardize comment style
Java.txt: standardize descriptive header
Java.txt: simplify plane data structure

The linearized map was a bit convoluted and rather outside the scope of
the example. A list works just fine here.
Merge pull request #485 from joshmoore/rebased/develop/OMERO_HOME_for_web_devs_11373

Omero home for web devs 11373 (rebased onto develop)
merge develop -D org -I include -E exclude: PR 450 (omero: Python 2.6 is the minimum supported version)
merge develop -D org -I include -E exclude: PR 486 (put permissions warning into a proper warning box (rebased onto develop))
merge develop -D org -I include -E exclude: PR 487 (Fix Java code examples (rebased onto develop))