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11 zxspectrum improvements:

- Added ZX Spectrum ROM mods as described in the blog:
http://www.baltazarstudios.com/zx-spectrum-rom-mods
This mod allows NMI interrupt to break into a special
handler code inside the ROM image and let the user
type a POKE address (5 decimal digits) + value (3
decimal digits) to modify a memory location
- Changed default joystick pins to Atari style joystick
as described in the blog
- Added a timing constraints file
gdevic 3006d 10h /
10 zxspectrum: Various improvements

- Fixed keyboard bug (by Bogdan S.)
- Minor comment changes
- Renamed reset to nreset
gdevic 3052d 00h /
9 Updated documentation gdevic 3052d 18h /
8 z80: Release 4 gdevic 3052d 20h /
7 z80: Fixing repeating INIR/OTIR class of instructions gdevic 3117d 00h /
6 Added deployment folder with all files needed to use the CPU
Changed ZX Spectrum project to use deployment files as example
Changed extension for Verilog include files from *.i to *.vh
Updated documentation; added section on file generators
Minor corrections and fixes to various files
gdevic 3467d 11h /
5 zxspectrum: Various improvements

- Added "Turbo" speed mode switch (SW2)
- Turbo speed is (3.5 MHz x 2 = 7.0 MHz)
- LEDG5 lits when a key is being pressed
- LEDG6 blinks when a speaker/line-in is being toggled

Misc:
- Fixed a false clock for ula:beep
- Fixed unused Kempston input warning
- Updated documentation to 1.1
gdevic 3497d 00h /
4 - Removed files that are left in the root folder gdevic 3503d 01h /
3 - New directory structure
- Added documentation files (and PDF versions)
- Fixed tests
gdevic 3503d 01h /
2 Initial import of the A-Z80 project files. gdevic 3509d 00h /
1 The project and the structure was created root 3509d 07h /

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