Resolve #3010 : add --nestingMaximum switch

[idodeclare]

Hello,

Please consider for integration this patch to add a --nestingMaximum switch to help user @sirisan who has a RepoRepository setup with two levels of nesting.

Default will continue to be just one level.

Thank you.

[coveralls]

Pull Request Test Coverage Report for Build 5184

• 14 of 18 (77.78%) changed or added relevant lines in 4 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.06%) to 73.443%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
opengrok-indexer/src/main/java/org/opengrok/indexer/history/HistoryGuru.java	4	5	80.0%
opengrok-indexer/src/main/java/org/opengrok/indexer/index/Indexer.java	2	3	66.67%
opengrok-indexer/src/main/java/org/opengrok/indexer/configuration/Configuration.java	5	7	71.43%

Files with Coverage Reduction	New Missed Lines	%
opengrok-indexer/src/main/java/org/opengrok/indexer/history/HistoryGuru.java	1	69.18%
opengrok-web/src/main/java/org/opengrok/web/api/v1/controller/FileController.java	4	53.49%

Totals
Change from base Build 5182:	0.06%
Covered Lines:	37887
Relevant Lines:	51587

---

💛 - Coveralls

[idodeclare]

@tulinkry, thank you for the review!

[tarzanek]

lgtm, merging

[tarzanek]

thanks guys!

[idodeclare]

Thank you, @tarzanek!