Added SDA.

Update DTA/PSP to use SDA.
Added some more pic commands.
Cleaned dos.cpp up a bit.
Handled some more calls in dos.cpp.
Changed execute and terminate to mess less with the dta.
Removed all dta references and changes in PSP.
Added some messages to messagefile for mount.


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1787

ChangeLog

@@ -2,6 +2,19 @@
   - Fixed commandline parsing when .bat files involved (fixes -exit)
   - Fixed issues with tabs in commandline not being processed correctly
   - Returned filename in ds:dx in create-random-file (c2woody)
+  - Cleaned/improved shutdown sequence.
+  - Fixed a bug with date and time used on open files.
+  - Added ps2 mouse-emulation in bios interrupts. (c2woody)
+  - Made our XMS driver conform the specs better. (c2woody)
+  - Added intelligent mpu401 emulation. (Srecko)
+  - Changed sensitivity settings of the mouse.
+  - Fixed a bug with an unterminated string in the drivelabel.
+  - Changed file search routines a bit to be more compatible.
+  - Added support for attribute-searching with fcb's
+  - Changed OpenGL so that it is initialized only when used.
+  - Added basic SDA.
+  - Changed psp and dta functions to use dta.
+  - Added some more PIC commands. (c2woody)
 
 0.61
   - Added a beta dynamic cpu for x86 hosts (very unstable)