flash: Add support for TEMPPAGE writing.

The proper way to write to flash on the AVR is to write
to the temp page and then write that temp page to flash.
This allows cancellation with the RWWSRE bit for clearing
out the temp page without writing it to flash.

This fixed a bug where the RWWSRE bit was being set in a
command, but the flash driver was improperly writing whatever
was in r0/r1 to the first address in the page, overwriting
what was already there. In reality, the code running on the
core was trying to just flush the temp page or unlock the read
while write section.
make: Link libelf in libsimavr.so.1 target

The build (sometimes) fails if libsimavr.so.1 is not linked with
libelf (see https://bugs.archlinux.org/task/40309).
Update README.md

Lots of cores were missing in the readme
Merge pull request #70 from cardoe/flash-fix

flash: Add support for TEMPPAGE writing.
avr_timer: refactor avr_timer_write and avr_timer_reconfigure

avr_timer_reconfigure: calculations moved back in call chain to
 avr_timer_write.

avr_timer_configure: use data processed in avr_timer_write.

avr_timer_init: changed to fully trap writes going to as2,
 clock select bits and waveform generation mode bits.

	modified:   ../../simavr/sim/avr_timer.c
	modified:   ../../simavr/sim/avr_timer.h

avr_timer: remove as2 timer check.

	modified:   avr_timer.c
Merge pull request #77 from dougszumski/ssd1306_demo

New part & example for a SSD1306 OLED driver
Merge pull request #57 from bsekisser/avr-timer-as2-cs-mode

avr_timer: refactor avr_timer_write and avr_timer_reconfigure
parts: Bug fix for i2c_eeprom part

    Fixes:

    > Part address and mask weren't set in i2c_eeprom_init. The
      virtual part responded to all addresses.
    > Mask required inverting to function as per the description in
      i2c_eeprom.h
Makefile: fix for OSX bash variable substitution

This was generating a bad config file

Signed-off-by: Michel Pollet <buserror@gmail.com>
cores; 128rfr2, tiny84 and megax8, temp fix for bad arv-libc headers

Temporary, to make the build work. Seems the latest avr-libc in debian
is rather mangled.

Signed-off-by: Michel Pollet <buserror@gmail.com>
Merge pull request #78 from dougszumski/i2c_eeprom_bugfix

parts: Bug fix for i2c_eeprom part
Merge https://github.com/buserror/simavr into avr_twi_bugfix

Conflicts:
	examples/parts/i2c_eeprom.c