Note: this slipped through the cracks because GNU's string.h apparently exposes an object named "index". Compiling under mingw revealed the bug.

add defines for sys_open, sys_close, sys_fopen and sys_fclose as placeholders until the code to handle utf-8 filenames on Windows gets ported

remove old *.tcl files (except for pd.tk, as there are a few procs there we may want to keep for reference for awhile)

(I forgot to actually test the branch that handles strings with quotes in them)

allow this to work:
gui_start_vmess("foo", "");
gui_start_array();
gui_s("hello");
gui_end_array();
gui_end_vmess();

In other words, a gui message with a single array argument. There should rarely be a need for this (if at all), but it should still send a well-formed message to the GUI (which it wasn't before this bug fix)

First stab at making the "Cancel" button in gatom dialog actually revert to the previously saved values.

* make scaling follow the mouse more consistently

* simplify GUI API
* get rid of canvas_createobj

first attempt at lifting the limitation on the size of text typed in new objects in the GUI which get sent to Pd. We're sending in chunks smaller than the buffer to achieve this.
* this needs a lot more testing
* still subject to Pd's limit of 1000 bytes per t_symbol
* probably want to protect the new canvas methods from segfaults in case the users start fooling around with them

only put a new message box in floating mode (i.e., following the mouse) if it doesn't have an autopatch connection to the object above it