port Seaside to 3.7.0

[dalehenrich]

initial Seaside test runs against 3.7.0 have quite a few failures:

**************************************************************************************
	Results for Seaside3 tests
1447 run, 1304 passes, 0 expected defects, 128 failures, 15 errors, 0 unexpected passes
**************************************************************************************

failures likely due to a change to one of the fundamental GemStone methods ... the handling of breakpoints has changed, which was the source of GLASS failures, but the GLASS tests are running clean at this point ...

[dalehenrich]

main problem was I needed to add 3.7.0 to baseline, but a new release of gsApplicationTools was needed to fix some real 3.7.0 issues

[dalehenrich]

additional changes have been made to GemStone 3.7.0, so reopening.

In GemStone 3.7.0, ReadByteStream (an optimized version of ReadStreamPortable) is now returned as a result of the #readStream method (formerly AnsiReadStream), so ReadByteStream>>seasideMimeDocument needs to be implemented (see SeasideSt/Grease#129 for related changes)