[GHC] #2153: GHCi does not have a :source command to load further .ghci files

[Yitzchak Gale]

Claus Reinke wrote:
>  i tried at the time to get others to post their .ghci files at well,
>  and share their favourite tricks, but there weren't many responses.

OK, OK. I just posted "Customized GHCi interactive environments"
to wiki. It's a simple but very powerful trick that I use all the time.

I hope others will also post their favorites.

-Yitz