Changes build to use 1.6 source since it no longer compiles with 1.5.
Changes incorrect function call.

For some reason, the call to obtain a short array was
JNI_getIntArrayRegion instead of JNI_getShortArrayRegion which it
was supposed to be. This now resulted in compile errors and was
fixed.
Removes obsolete include.

A reference was made to a javah generated include file from a class
that had no native methods. A modern javah does not emitt an include
file for such a class. A fact that now revealed the unnecessary
include.
Changes some pointers using the old pljava-jdbc to be just pljava.
Changes the dependency to the maven-nar-plugin to 2.1-pljava-SNAPSHOT

We need to have the 'pljava' keyword in the qualifier to be able to
differentiate between the Maven snapshot and the patched version that
must be used until the
pull-request:

  https://github.com/maven-nar/maven-nar-plugin/pull/22

has been accepted and made public.
Adds the pljava-so module to the parent pom.
Adds Eclipse IDE artifacts.

One can argue that the source should not target a particular IDE and
thus should not contain Eclipse specific artifacts. The counter
argument is that there's no harm in having them. They don't conflict
with other IDE's or build environments and they don't consume space.

They are however, very convenient if you are using Eclipse and m2e.
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