Clarifies system.lines() docstring.

Amends cfb72d1b665abdf4319a34520ac34d868b480c03.
References TRune, links unicode modules where mentioned.

Amends 3b98f70cc6ae5be7063762d05fd127522f526674.
Merge pull request #817 from gradha/pr_improves_docs2

Improves docs2
Merge pull request #818 from hiteshjasani/pr_devel_doc_import_constraints

Add docs for constraining and qualifying imports.
Merge branch 'devel' of https://github.com/Araq/Nimrod into devel
better tester
unittest module works again
resolved conflicts with master
make encodings.nim case consistent
'inject' for the new symbol binding rules in templates
it's the year 2014
merge master into devel
'nil' as a statement is deprecated, use an empty 'discard' instead
Corrected prunesocketset and pruneprocessset

fd sets passed to select() were pruning ready FDs rather than pruning
UN-ready FDs.
Added ret != 0 back
Merge pull request #822 from onionhammer/devel

Corrected prunesocketset and pruneprocessset
compiler warns when you use GC'ed memory and '--gc:none'
Merge branch 'devel' of https://github.com/Araq/Nimrod into devel
command syntax is allowed in expressions
updated grammar.txt