scons: clean up the main SConstruct file more. Add some features to read_command so it works a little bit better Clean up the mercurial checks. Filter the user environment and only pick out the useful stuff.
scons: clean up the main SConstruct file more.
Add some features to read_command so it works a little bit better
Clean up the mercurial checks.
Filter the user environment and only pick out the useful stuff.

cancro7/gem5,kaiyuanl/gem5,cancro7/gem5,KuroeKurose/gem5,Weil0ng/gem5,yb-kim/gemV,rjschof/gem5,HwisooSo/gemV-update,markoshorro/gem5,zlfben/gem5,rjschof/gem5,gedare/gem5,rallylee/gem5,qizenguf/MLC-STT,SanchayanMaity/gem5,yb-kim/gemV,HwisooSo/gemV-update,SanchayanMaity/gem5,SanchayanMaity/gem5,samueldotj/TeeRISC-Simulator,Weil0ng/gem5,cancro7/gem5,qizenguf/MLC-STT,sobercoder/gem5,rallylee/gem5,Weil0ng/gem5,austinharris/gem5-riscv,powerjg/gem5-ci-test,gem5/gem5,powerjg/gem5-ci-test,SanchayanMaity/gem5,joerocklin/gem5,TUD-OS/gem5-dtu,aclifton/cpeg853-gem5,joerocklin/gem5,Weil0ng/gem5,HwisooSo/gemV-update,austinharris/gem5-riscv,sobercoder/gem5,briancoutinho0905/2dsampling,markoshorro/gem5,aclifton/cpeg853-gem5,aclifton/cpeg853-gem5,yb-kim/gemV,joerocklin/gem5,zlfben/gem5,briancoutinho0905/2dsampling,yb-kim/gemV,markoshorro/gem5,austinharris/gem5-riscv,kaiyuanl/gem5,gedare/gem5,joerocklin/gem5,qizenguf/MLC-STT,HwisooSo/gemV-update,austinharris/gem5-riscv,sobercoder/gem5,rjschof/gem5,rallylee/gem5,KuroeKurose/gem5,rallylee/gem5,gedare/gem5,HwisooSo/gemV-update,gem5/gem5,rjschof/gem5,zlfben/gem5,KuroeKurose/gem5,samueldotj/TeeRISC-Simulator,briancoutinho0905/2dsampling,gem5/gem5,KuroeKurose/gem5,yb-kim/gemV,powerjg/gem5-ci-test,powerjg/gem5-ci-test,TUD-OS/gem5-dtu,kaiyuanl/gem5,qizenguf/MLC-STT,yb-kim/gemV,gedare/gem5,Weil0ng/gem5,samueldotj/TeeRISC-Simulator,powerjg/gem5-ci-test,cancro7/gem5,markoshorro/gem5,KuroeKurose/gem5,powerjg/gem5-ci-test,briancoutinho0905/2dsampling,gem5/gem5,TUD-OS/gem5-dtu,briancoutinho0905/2dsampling,cancro7/gem5,zlfben/gem5,gedare/gem5,SanchayanMaity/gem5,samueldotj/TeeRISC-Simulator,samueldotj/TeeRISC-Simulator,qizenguf/MLC-STT,gedare/gem5,SanchayanMaity/gem5,kaiyuanl/gem5,rjschof/gem5,samueldotj/TeeRISC-Simulator,yb-kim/gemV,aclifton/cpeg853-gem5,Weil0ng/gem5,KuroeKurose/gem5,rallylee/gem5,TUD-OS/gem5-dtu,HwisooSo/gemV-update,zlfben/gem5,joerocklin/gem5,joerocklin/gem5,aclifton/cpeg853-gem5,qizenguf/MLC-STT,TUD-OS/gem5-dtu,markoshorro/gem5,aclifton/cpeg853-gem5,yb-kim/gemV,zlfben/gem5,aclifton/cpeg853-gem5,cancro7/gem5,sobercoder/gem5,TUD-OS/gem5-dtu,HwisooSo/gemV-update,gem5/gem5,markoshorro/gem5,rjschof/gem5,markoshorro/gem5,qizenguf/MLC-STT,TUD-OS/gem5-dtu,briancoutinho0905/2dsampling,rallylee/gem5,kaiyuanl/gem5,powerjg/gem5-ci-test,KuroeKurose/gem5,gem5/gem5,rallylee/gem5,Weil0ng/gem5,rjschof/gem5,austinharris/gem5-riscv,austinharris/gem5-riscv,austinharris/gem5-riscv,joerocklin/gem5,cancro7/gem5,kaiyuanl/gem5,SanchayanMaity/gem5,sobercoder/gem5,gedare/gem5,gem5/gem5,kaiyuanl/gem5,sobercoder/gem5,briancoutinho0905/2dsampling,samueldotj/TeeRISC-Simulator,zlfben/gem5,sobercoder/gem5,joerocklin/gem5