Change fragment delimiters from [> and <] to [ and /]

[rsmckinney]

Change fragment delimiters from [> and <] to [ and /].

While writing tests for manifold-sql, where fragments are used a lot, I personally found typing [>Xxx.sql<] to be a pita. Although not quite as unique as the existing delimiters, the proposed delimiters [Xxx.sql/] are easy to type/read and are unique enough to pass the github regex search test. Other delimiters that were considered: [[Xxx.sql]], >>Xxx.sql<<, and some others.

A side note:
Although it is unlikely there will be a string or comment beginning with a full syntax match for a fragment, what if the unlikely happens? The errant comment or string literal would cause a compile error and would have to be changed. Not a big deal. Another option is to make the delimiters configurable. Simple enough to do.

[rsmckinney]

Fixed with release 2923.1.15