Make CONTROL + DELETE delete a line

If CONTROL + INSERT inserts a line then it seems natural CONTROL + DELETE
removes a line.
Make Shift+Home equal to CLS in ascii mode
Remove duplicated code in strhandle

The error condition was duplicated in two different switches.
This new version centralized the error handling in only one place.
Remove non defined behaviour in selcopy

It is not defined when lateral effects of expressions are
calculated, so an expression as:

	--last >= gp && !(selected(last - gp, y)

is non portable.
Removing the w3img support.

The patch to add w3img support destroys our way to handle fps and so stop
wasting resources on fast scrolling. Due to w3img being a hack to display
images in an ugly way, is there no need to support this. Use some real way to
display images.
Merge remote-tracking branch 'origin/master'
Add xstrdup function

Since we are using xmalloc, xrealloc ..., then it is not logical
call directly to strdup.

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>
Add MC sequence

This sequence control when the printer is enabled or disabled. This
sequence control the behaviour of the -o option.
Style matters.
Style cleanup.

Add some note about the main reason why st is still that big.
Add MC for a single line

This sequence print the current line. It is different to the
'printer on' sequence, where all the characters that arrive to the
terminal are printer. Here only the ascii characters are printed.
Add MC for the full screen

This sequence is very useful because allows comunicate the content
of the terminal to another program.
Add key definition for printer sequences

These new combinations generate the same behaviour (basically) of
vt102. It is a good way of communicating st with other programs.

[0] http://www.vt100.net/docs/vt102-ug/chapter2.html
Add sequence for printing the current selection

This is very usefull in order to can select what is sent
to the plumber.
Add terminfo entries for printer

These capabilities inform to programs how print in local printer
of the terminal.
Merge branch 'master' of ssh://suckless.org/gitrepos/st
Merge branch 'master' of http://git.suckless.org/st

Conflicts:
	config.def.h
	st.c