javadocs
update [ci skip]
updates
allow setting of legend series line length: issue #38
CSV import and export with errors bars
changed error bar line weight
fixed issues 39 and 40
added north inside position for legend
[ci skip] pom clean up
[maven-release-plugin] prepare release xchart-2.2.1
[maven-release-plugin] prepare for next development iteration
Merge branch 'develop'