Add TODO comments to reload NERDTree and review installed plugins
Add pasting-related mappings from sheerun post

Copied and reworded from http://sheerun.net/2014/03/21/how-to-boost-your-vim-productivity/

I removed <silent> to make the command simpler because I don’t think they would ever echo something that needs to be silenced.

I don’t remember ever wanting this implementation of gV, but I’ll try it out and see if it turns out to be useful. At least, I never needed the old gV.
Convert indentation from spaces to tabs to match rest of file

I copied and pasted it without checking.

I noticed this discrepancy while trying out the DetectIndent plugin.
Add DetectIndent plugin

This should make it easier for me to work on other people’s code, such as when contributing to open source projects.
Change NERDTree mapping from <Leader>ne to <Leader>n

It was too cumbersome to remember and type “ne”, and there is currently no shortage of keys, so “n” is fine. If I later find another command that really should be at <Leader>n, I can change this back to “ne”.
Automatically detect indentation on all opened files

The detection is unreliable right now, so this gives wrong settings sometimes, such as in CSS files with indented comments. But I’m about to switch to a fork of this plugin that fixes that.
Switch to my own fork of the DetectIndent plugin

Most of its changes from the original were made by others. This version has much more reliable indentation detection, making it worthy of being run on every opened file.
Remove plugins L9 and FuzzyFinder

The newly-installed CtrlP plugin replaces FuzzyFinder. A little searching shows that people prefer CtrlP to FuzzyFinder, so I don’t need it FuzzyFinder. And L9 is just a dependency of FuzzyFinder.

What’s more, L9 and FuzzyFinder don’t have proper .gitignores, so their submodules annoyingly always show up as modified after a :BundleInstall, because some tags were generated. I’ll be glad to get rid of them.

Not to mention that L9 on vim.org hasn’t been updated in years, though it’s still being developed on BitBucket. They haven’t bothered updating it.

I think L9 was only required for the FuzzyFinder plugin. I don’t get any plugin errors after removing both those plugins. But if I get any errors that a plugin requires L9 later, I can just install it again.