1.2.10-beta_20161230

Changes since version 1.2.10-beta_20161221:

• updated SID emulation to use reSID 1.0 instead of 0.16
• new execute ('x') type of breakpoints, the ignore data reads button has been removed
• it is possible to delete single breakpoints in Lua scripts by using a negative priority value
• the debugger window has been made resizeable within a limited range
• if the stack pointer is $FF, the stack dump is shown at $0200 instead of $0100
• scons -c install removes all configuration files installed by p4makecfg
• more accurate emulation of 6522 VIA timers
• minor optimizations