v2.51

• fix a cmd: size qualifiers weren't fully skipped if they contained digits (near16/32, far16/32).
• fix DebugR dl cmd: the debugger assumed the limit of the LDT to be <= 0xffff, hence didn't display anthing if limit was i.e. 0x10000.
• fix DebugR dg/dl cmd: gates in GDT/LDT were displayed in memory descriptor format.
• fix DebugB l cmd: allow 32-bit sector numbers (usepacket != 0).
• DebugR vc/vt/vl cmds: vectors can be (un)trapped selectively for ring 0 and 3.
• DebugXf: handle exc 0 like 1,3,0dh and 0eh first, before client; 'skip' cmd still missing!
• DebugR(V): don't stop if "invalid" values in registers FS,GS are detected.
• DebugB: added check if already loaded beyond conv. memory.
• Debug/DebugB fix: hw bp implementation for these variants was flawed.
• DebugB: as default, b cmds and hw bps activated for this variant.
• DebugB: added LDebugB to load DebugB into JLM FastBoot.
• DebugR: (optionally) handle exception 02 (NMI).