Bugfix/highlighting

[idodeclare]

Hello,

Please consider for integration this patch to fix some highlighting bugs:

• Fix ContextFormatter bounds problem.
• Fix PassageConverter mistakenly counting EOL and sometimes eliding too much from the left.

IntelliJ was also helpful in suggesting some nice simplifications of the code.

Thank you.

[coveralls]

Pull Request Test Coverage Report for Build 3624

• 42 of 42 (100.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 73.439%

---

Files with Coverage Reduction	New Missed Lines	%
opengrok-indexer/src/main/java/org/opengrok/indexer/search/context/PassageConverter.java	1	92.17%

Totals
Change from base Build 3623:	0.04%
Covered Lines:	32845
Relevant Lines:	44724

---

💛 - Coveralls

[tarzanek]

merging, thank you Chris!