Changed hashtable from glib to compat/hashtable
debug information to understando why its not working withe the internal hashtable
Refdb changed to work with the internal hash table implementation (but its not working yet)
Add :exec prompt command and inline test commands that uses key bindings

This also documents :save-display, :script and :exec in the manual.
Fix the test editor script to optionally read the line number argument

Passing a non-number argument to printf(1)'s "%d" format on Mac OS X
(Yosemite) causes an error.
Fix and improve status on-branch information

Add a test for the different on-branch "modes" based on whether
git-rebase, git-am or git-merge is in progress or whether a detached
head has been checked out.

This also changes status view refreshing to only reload the current
branch information and not all refs as suggested in #341. Note that it
actually reloads all repo information to get both the symbolic ref
pointed to by HEAD as well as the HEAD id.
Use load_repo_head() when reloading refs

This ensures that the HEAD and HEAD ID is always in sync.
Remove unneeded forward declaration of graph_canvas struct
Split rendering of changes commit in two

The index is checked in main_open but the lines are added when the first
commit is read. This ensures that the changes commits are only displayed
if git-log finds any commits.
Remove graph canvas member from struct graph

It seems more clean to pass it to those that modify the commit graph
canvas.
Allocate the graph member in the main_state struct
Unify option_info lookup for normal options and view column options
Refactor view column option lookup to make it reusable
Simplify view config checking
Fix enum_name_copy method signature
Make parsing of view column expressions reusable
Add shorthand for changing the view settings of a single column

This allows to easily override the defaults from tigrc of specific view
columns without having to copy-paste the whole configuration from the
system tigrc.

Fixes #318
Add doc example for disabling automatic use of topo-order for the graph

References #310
Use type alias to identify view settings and simplify option parsing
Support all option name separators when parsing view settings shorthands