Remove GsContext from Seaside-GemStone-Core (SeasideSt/Seaside#1223), new Filetree (dalehenrich/filetree#195), port to 3.6.0

[dalehenrich]

GsDevKit/Grease has historically been used with GLASS1 (mainly because it takes time to do the conversion and some manual steps might be needed). I am having to modify some of the Seaside/GLASS code for 3.6.0 and it is likely that I will also have to make changes to dalehenrich/tode. So it seems that this is a good time to make the switch:

• change GLASS1 to use SeasideSt/Grease instead of converting GLASS1 to use SeasideSt?Grease will just fix The class GsContext is in both Seaside (Seaside-GemStone-Core) and Grease (Grease-GemStone-Core) SeasideSt/Seaside#1223. See this discussion for details
  1. Convert GLASS1 to use SeasideSt/Grease and 3.6.0 port SeasideSt/Grease#109
  2. Convert GLASS1 to use SeasideSt/Grease instead of GsDevKit/Grease GsDevKit#124
• Drop Swazoo from Seaside - Drop Swazoo from Seaside for GemStone? SeasideSt/Seaside#1222
• Port Seaside to 3.6.0 - Port Seaside to 3.6.0 SeasideSt/Seaside#1226
• change GLASS1 to use branch issue_195 of tolerate and eventually support "Metadata" : "false" -- GitFileTree metadata-less mode -- in GemStone dalehenrich/filetree#195. This is needed to properly support the use of SeasideSt/Grease, because SeasideSt/Grease no longer uses monticello meta data and GsDevKit/Grease has continued to use monticello metadata ...
• fix default comments with a comment time stamp are showing up when no comment expected (3.5.0 on) GsDevKit#126 ...
  • fix the bootstrap code in 3.6.0 first
  • add fix to GLASS1
  • explore potential to patch during GLASS1 load if not possible patch in 3.5.4
• port dalehenrich/tode to 3.6.0
  1. port to GemStone 3.6.0 dalehenrich/tode#313
• port GsDevKit/GsDevKit_upgrade to 3.6.0
• port GsDevKit/GsDevKit_home to 3.6.0

[dalehenrich]

GsDevKit/gsApplicationTools#39 is not specifically related to 3.6.0, so we're good to go