remove rogue clara jar

[baltzell]

There's a jclara-4.3.jar in this repo, which gets installed via COATJAVA's build script into coatjava/lib/utils. That "rogue" jar serves (only) as a runtime dependency for the components of COATJAVA that extend CLARA, when run from outside CLARA, e.g. recon-util. Meanwhile, a normal CLARA installation also includes its own jclara jar, which CLARA runtime uses while explicitly ignoring coatjava/lib/utils. COATJAVA's maven build also ignores this rogue jar.

This pull request takes a small step in cleaning this up by:

1. Removing the rogue jclara jar from coatjava's source repository.
2. Instead using maven to retrieve and install a remote copy of that jar in coatjava/lib/utils
3. Updating the maven build to use a new, non-SNAPSHOT jclara 4.3 maven repository

Also, as a prerequisite, a non-SNAPSHOT 4.3 maven repo was manually created on clasweb (by copying 4.3-SNAPSHOT).

• Note, by construction, the resulting coatjava/lib/utils/jclara-4.3.jar is identical in filesize and jar tf output.
• Note, this also facilitates moving away from this legacy jclara 4.3 dependency towards a maintained maven repo based on https://code.jlab.org/hallb/clas12/coatjava/clara-java.
• Note, CLARA versions after 4.3 only change CLARA runtime.