App still uses locally-embedded JAR

[medavox]

org.javia.arity 'Arity' is an arithmetic engine for for Java, by Mihai Preda.

It's currently used in:

com.cybrosys.basic.HistoryAdapter
com.cybrosys.basic.Logic
com.cybrosys.scientific.EventListener
com.cybrosys.scientific.HistoryAdapter
com.cybrosys.scientific.Logic
com.cybrosys.unit.Calculate

(Some of these classes may be duplicates, but that's a problem for another issue)

Originally a Freshmeat project, the project was apparently moved to Google Code some time after 2008. There are no working links for this URL; apparently it was excluded from the Google Code archive.

The code was imported from google code several times, by several different people. The most notable imports are:

• By the original author in 2014. The project was renamed to Arithmetic, then seemingly reabandoned. Uses an obscure python build system setup.py.
• By Hoijui in 2016. This version includes a standard Maven pom.xml, and successfully builds as of this writing.
• A fork from Preda's version by piusvelte, which includes original work to fix precision errors by using Java's BigDecimal API
• A fork from Hoijui's version apparently fixes mathematical errors; but the comments & commit messages are in Chinese, so these were overlooked originally.

For now, using the embedded JAR does work. But this project needs a better solution going forward. Checking binaries into git is never a good strategy, and relying on abandoned code that can't be updated is also a very bad idea.

Proposed Solution

A Jitpack build of Hoijui's version currently succeeds; in order to guarantee code availability going forward, this version should be forked into a repo controlled by this project.

From there, we can also include the improvements done by piusvelte