Feature/verilog

[idodeclare]

Hello,

Please consider for integration this patch to add a Verilog analyzer requested eagerly by a couple of folks a few months ago.

Also, I patched some additional nits found while testing:

• Do not throw if source file unavailable for Context.
• Output --help to stdout not stderr, with EXIT STATUS=0.
• Show full path when logging missing xref.
• Short-circuit option -R if --help|-h|-? is used.

Thank you.

[coveralls]

Pull Request Test Coverage Report for Build 3997

• 297 of 309 (96.12%) changed or added relevant lines in 7 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.2%) to 73.557%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
opengrok-indexer/src/main/java/org/opengrok/indexer/index/IndexDatabase.java	2	3	66.67%
opengrok-indexer/src/main/java/org/opengrok/indexer/search/Results.java	0	4	0.0%
opengrok-indexer/src/main/java/org/opengrok/indexer/index/Indexer.java	5	12	41.67%

Files with Coverage Reduction	New Missed Lines	%
opengrok-indexer/src/main/java/org/opengrok/indexer/index/IndexDatabase.java	1	54.36%
opengrok-indexer/src/main/java/org/opengrok/indexer/search/Results.java	2	0.0%

Totals
Change from base Build 3993:	0.2%
Covered Lines:	33565
Relevant Lines:	45631

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💛 - Coveralls

[tarzanek]

lgtm, merging