SEADAS Band Grouping Improvements

[knowles]

Modifications made to improve Band Grouping. Note a related (likely dependent) pull request appears in both snap-engine and snap-desktop. So all description is given here in this pull request.

Some example matches:

1. "^a_" would match bandnames starting with "a_" (for example "a_442") and create a display folder named "a"
2. "_unc$" would match bandnames ending with "unc" and create a display folder named "unc"
3. "^chlor_a$" would match only "chlor_a" and create a display folder named "chlor_a"
4. "Rrs" would match any bandnames containing "Rrs" and creates a display folder named "Rrs"
   Note in this scenario there is a boolean field:
   snap-core/src/main/java/eu/esa/snap/core/datamodel/group/BandGroupingPath.java line 16:
   boolean useStartsWithInsteadOfContains = false;
   SeaDAS sets this to "true" which changes the behavior to:
   "Rrs" would match any bandnames starting with "Rrs"
5. "Rrs*" wildcards are still supported however are not supported in combination with "^" and "$":
   For example "^Rrs*" would ignore "^" as a match criteria.
   The display folder removes "" if at start or end of name, but not in the middle of the name:
   For example:
   "Rrs" creates folder "Rrs"
   "Rrs" creates folder "Rrs"
   but "Rrsunc" create folder "Rrs*unc"
   6 "Coords#latitude,longitude" would match bandnames "latitude" and "longitude" and create a display folder named "Coords".

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[knowles]

I added a small change and pushed it today in this pull request.