* massive structural rewrite. Split off code into several new modules (render, render_png, render_local) and updated new modules to use them.
* the beginnings of render_multi, really not done yet

committer: Tero Marttila <terom@fixme.fi>

separate http query argument parsing into a new http module, and clean up unused headers from web_main.c

committer: Tero Marttila <terom@fixme.fi>

two new modules, remote_node and remote_pool

committer: Tero Marttila <terom@fixme.fi>

* fix Makefile to build in a (more) sensible way (still not really perfect)
* a parse_hostport in common
* fix warnings in render_file
* commandline argument parsing for render_node
* render_remote takes a struct remote_node, maintains its current_load, and actually close the socket after use now
* web_main uses a remote_pool, accepts nodes on the command line, and picks nodes from there for render_remote
* improve _http_render_execute error handling, sends back an error reply now
* ignore SIGPIPE. This hadn't shown up before (probably read-EOF instead), but it uncovered a bug in evhttp that caused an infinite bufferevent_write loop -> oom_killer -> DoS attack
* yes, this commit is missing four new files, those will be included in the next one

committer: Tero Marttila <terom@fixme.fi>

documentation bugs

committer: Tero Marttila <terom@fixme.fi>

flow control for web_main.c

committer: Tero Marttila <terom@fixme.fi>

remove a misplaced argument from render_remote.h (it still compiled and worked fine\!?)

committer: Tero Marttila <terom@fixme.fi>

updated code to use libevent svn (with custom modifications, need to create a git repo for that)

committer: Tero Marttila <terom@fixme.fi>

working chunked-streaming of remote-rendered mandelbrots in web_main, next step will be flow control. Remote rendering doesn't compile in render_node.

committer: Tero Marttila <terom@fixme.fi>

working web_main that uses render_remote

committer: Tero Marttila <terom@fixme.fi>