Changelog for BuildCraft 7.99.20

Breaking changes:

The flood gate no longer uses the open sides to determine the sides to fill out in-world. (AlexIIL)

Re-added JSON-based assembly recipes, and made them load from "/config/buildcraft/assembly_recipes_pre_mj" folder. (AlexIIL)
Currently they will crash the game if any errors are detected in any of the json files - although it will print out every error before crashing.
The "pre_mj" bit is important - these assembly recipe formats will change in the future MJ update, so please don't create a lot of them or you will just have to rewrite them in the future.
Integration table recipes haven't been re-added though.
Added a config option for tweaking the maximum depth that the mining well, quarry, and pump can extend their tubes. (AlexIIL)
This is called "general.miningMaxDepth" and can be changed from anywhere between 32 and 4096.
(Values above 256 make no difference in vanilla, this is primarily for Cubic Chunk support)
Added the command "/buildcraft reload" which reloads all buildcraft data registries. (AlexIIL)
In 1.13 this will be merged into the vanilla minecraft "/reload" command.
This currently doesn't reload client-side registries, although you can still reload the guide page registry by using F3+T while in the guide GUI.
Added an advancement for the guide book recipe.

[meta] BuildCraftCompat is now included in an "all" jar file (named "buildcraft-all-7.99.20.jar").
The previous "buildcraft-7.99.19" jar file has been renamed "buildcraft-main-7.99.20.jar"
As such the compat module will have the same version number as the rest of buildcraft
In addition it no longer has a separate changelog.
Many improvements to the guide book:
The open book now shows more visibly if you are on the first or last page in the current chapter.
Made the next page and previous page buttons have a much bigger clickable area.
Added a second guide book for configuration information. It doesn't have a recipe because it isn't useful in the game
- This implies that you can add your own additional guide books, although there's not much point in doing so because addons should continue to use the main book "buildcraftcore:main"
- Alternative guide books can be created by running /give @a buildcraftlib:guide 1 0 {BookName: "domain:path"}
Added groups: related entries. Currently these can only be specified through code.
Auto-add a chapter with the name of the page entry at the very start (so that we don't need to do this manually)
Auto-add the relevant groups and recipes to the end of every page entry. Recipes won't be auto-added if they have been manually specified earlier in the entry.
The page title has been changed to brown rather than black, so that it stands out less than the actual text.

Fix the quarry, pump, and mining well not digging below Y=0 when cubic chunks is installed. (AlexIIL)
Slightly fix the quarry being slower than it should be - it's now a tiny bit faster than it used to be. (AlexIIL)
Fixed the pump and flood gate not working correctly with gaseous fluids. (AlexIIL)
[#4044] Vanilla flowing water blocks are invisible with BC installed (AlexIIL)
[#4296] The marker connector recipe requires buildcraft wooden gears rather than any item that has an ore-dictionary name of "gearWood" (AlexIIL)
[#4300] The obsidian pipe doesn't instantly pull in the entire stack of item entities that collide with it. (AlexIIL)
[#4305] Crash when rendering inside an enderIO gui. (AlexIIL)