Drop -l from ls alias

For a long time, I was an avid user of -l option. But yesterday, I
started playing with git-annex, and -l option turned out to do more harm
than good. git-annex replaces all the files with symlinks to new
location, and -l shows where each link points to. With new locations'
paths being a hundred symbols or more, it wasted a lot of screen space
for no good reason. The only solution I saw is to stop using -l option
altogether.

So far it turns out good enough. I discovered I don't need most of
information provided by -l. Most of the time, I don't need it at all!
When need arise, I can ask for file size explicitly with du, and I am
being notified of flagrantly incorrect file permissions by --color.

Let's see how it will turn out in the long term.