Update user name to id cache on save

Should fix #1731
Metadata name consistency
Fix possible edge case
Add basic detachable post editing dialog

#1875
Merge branch 'post-edit-dialog'
#1875: Fix autocomplete floating in place on drag
#1875: Change detach icon
#1885: add prefetch for pools
#1885: add support for chrome
fixes #1855
fixes #1856
update version, update user listing to match promotion report
tweak Tag.trending algorithm
#1875: Tweak transparency
#1875: Update reltags

* Hide reltags by default when opening dialog
* Swap link arrows
* Display reltags when clicking a button
Merge branch 'master' of https://github.com/r888888888/danbooru
#1875: Auto-scroll to top of image
fixes #1892
fixes #1891
Fix hardcoded path in posts.js