Inject pom.properties if JAR doesn't have one

This is necessary to identify the origin of JAR files that are present
in the repository.
maven_depmap.py: Use dict-based string formatting where possible
Various spelling fixes in maven_depmap.py
Drop support for creating Maven repository

Creating maven repository by %add_maven_depmap was never realy used
and it didn't even work properly.

Creating Maven repository requires implementing support for mapping
different packaging types to artifact types (i.e. file extensions).
In previous code they were assumed to be the same, which is not true.
For example packaging type 'bundle' corresponds to artifact type
'jar', but it's not defined by Maven itself, but by Apache Felix
Bundle Plugin.  Existing code would create files with extension
'bundle' instead of 'jar'.

Besides that there exist artifact classifiers, stereotypes, attached
artifacts and other features.  Properly implementing them would
require at least generating effective POM, which in turn requires
artifact resolution (for parent POM).  That would mean re-implementing
a large subset of Maven logic, which is definitely out of scope for
Java Packages Tools.

Creating Maven repository, if really needed, is better implemented in
XMvn which can call Maven to do the hard work.