- update vga screen when you enter the logfunctions::ask() function.  This is   useful because sometimes useful messages are printed on the screen just   before a panic.  It's also potentially dangerous if the vga update function   calls ask() again...so I added a re-entry check.
- update vga screen when you enter the logfunctions::ask() function.  This is
  useful because sometimes useful messages are printed on the screen just
  before a panic.  It's also potentially dangerous if the vga update function
  calls ask() again...so I added a re-entry check.

dariaphoebe/bochs,dbrashear/bochs,dbrashear/bochs,dbrashear/bochs,dariaphoebe/bochs,dariaphoebe/bochs,dbrashear/bochs,dariaphoebe/bochs,dbrashear/bochs,dariaphoebe/bochs