Add `popup` package
Reduce number of max parallel syntax checks;
Don't start syntax check on find file;
Don't start syntax check if newline char was added/removed from the buffer;
Minor changes
Move `init-autocomplete` and `init-yasnippet` before `init-flymake`
Don't enable `electric-keywords`
Enable `perl-completion-mode` and `yas` on `cperl-mode` buffers
Don't load `flymake` through `Devel::PerlySense`
Load `flymake-perlcritic` after `init-flymake`
Fix `ps/external-dir`
Clean up
Try to init pde and perlysense on start
Remove old `auto-complete.el` and `cperl-mode.el`
Update submodules
Remove `auto-complete-config.el` as it is outdated
Update `yasnippet` (rename `yas/` to `yas-`)
Add `dropdown-list.el`
Add `flymake-tmp` to .gitignore
Comment `multiplecursors` and `haskell` packages out