Support limit configuration as percent

[mattnelson]

Support limits configured as decimal or percent.

I am in the process of migrating a large number of projects over to jacoco from clover due to the recent byte code filtering enhancements. In an attempt to minimize the amount of changes. I would like to be able to represent the coverage target in the same data format. My proposal is to support decimal and percent configurations by parsing the value in setMinimum[1] and setMaximum[2]. I'm not sure on the process this project follows for contributions since I didn't find anything in the readme/wiki. Is this a change you would be willing to accept? If so, I will issue a pull request.

<limit>
    <counter>INSTRUCTION</counter>
    <minimum>0.105</minimum>
    <minimum>10.5%</minimum>
</limit>

[1] https://github.com/jacoco/jacoco/blob/v0.7.9/org.jacoco.report/src/org/jacoco/report/check/Limit.java#L126
[2] https://github.com/jacoco/jacoco/blob/v0.7.9/org.jacoco.report/src/org/jacoco/report/check/Limit.java#L147

[marchof]

@mattnelson In general we accept PRs here. We're a pit picky about quality and clear concepts though 😉

But you proposal sounds reasonable. Please find some information for contributions here:

http://www.jacoco.org/jacoco/trunk/doc/conventions.html

Thanks!