Do not require cairo to have PDF, EPS, SVG support

Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
Add configure option to disable rrd_restore support

For systems that do not have libxml2 installed

Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
Add configure option to disable rrdcached

Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
Add configure option to disable examples

Having examples installed is not always desired
(e.g. no use of them on embedded systems)

Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
Use `env` to start tclsh instead of /bin/bash

This patch replaces the shebang line using /bin/bash with /usr/bin/env.
The previous version obfuscates which shell is being used by the tcl
script. Any benefits of using Bash as a start up are provided by `env`.

This closes issue #537.
Merge pull request #541 from romanofski/master

Use `env` to start tclsh instead of /bin/bash
Add "=encoding ISO8859-1" for es language.

On Ubuntu 14.04, pod2man gets failure for Non-ASCII character.

Signed-off-by: darklightwu <darklightwu@gmail.com>
Merge pull request #542 from darklightwu/master

Add "=encoding ISO8859-1" for es language.
Merge pull request #540 from maxnet/master

Loosen PDF, EPS, SVG, libxml2 dependency, and add --disable-feature options
moved to optional arguments and prepared FETCHBIN - currently identical to FETCH
implemented fetchbin protocol
as well as fixing a bug in fetch
fixed 0-byte issue in add_to_wbuf
changed output format to the version that tobi preferrs
added descriptions
fixed return codes to be "correct"
fixed returned number of lines by allowing arbitrary calculation
fixed output problems and switched to a generic function for delivery
Merge pull request #543 from msperl/master-daemon-fetchbin

FETCHBIN Daemon command also fixing FETCH limitations
do not require pango_font_map_create_context since pango_cairo_font_map_create_context works as well and EL5 is happy
keep requirements in sync with 1.4.9
Merge branch 'master' of github.com:oetiker/rrdtool-1.x