Fixed incorrect `binary not` calculation with wxlua and LuaJIT 2.1.

There appears to be an issue with `bit.bnot` included with wxlua,
which only manifests itself under LuaJIT 2.1 when SSE2 processing is
enabled. This is triggered by LuaJIT commit 57768cd (x86: Remove x87
support from interpreter), but the issue is with wxlua, not LuaJIT.
Fixed refresh of 'background' markers during debugging.
Fixed 'slow' mode of static analysis to work with Metalua 0.7.2.