Set/Unset Atomic Load : a pragmatic solution for part 2 of #2820
Set/Unset Atomic Load : a pragmatic solution for part 2 of #2820

This provides an ad-hoc way to solve the second part of
bug #2820 (Show Script not working when proof started inside a Load)

When doing Load on a file, two behaviors are possible:
- either the history stack is grown by only one command,
  the "Load" itself. This is mandatory for command-counting
  interfaces (CoqIDE).
- either each individual sub-commands in the file is added
  to the history stack. This allows commands like Show Script
  to work across the loaded file boundary (cf. bug #2820).

Ideally, we should be able to combine someday the benefits of
the two approaches. But in the meantime, we resort to a flag :
using "Unset Atomic Load" should make "Show Script" work across Load.

git-svn-id: 44dc50bdcc0f5d1a212c497508dc9452e0b35e2b@15601 85f007b7-540e-0410-9357-904b9bb8a0f7

letouzey/coq-wip,aspiwack/coq,8l/coq,gmalecha/coq,william-lawvere/coq,letouzey/coq-wip,coq/coq,william-lawvere/coq,mattam82/coq,Matafou/coq,barras/coq,Lionel-Rieg/coq,william-lawvere/coq,pirapira/coq2rust,mlasson/coq,amintimany/coq,herbelin/github-coq,coq/coq,asr/coq,letouzey/coq-wip,Lionel-Rieg/coq,Ptival/coq,JasonGross/coq,ppedrot/coq,gares/coq,shindere/coq,SkySkimmer/coq,ejgallego/coq,maximedenes/coq,pirapira/coq2rust,Zimmi48/coq,silene/coq,jhjourdan/coq,silene/coq,Zimmi48/coq,amintimany/coq,herbelin/github-coq,gares/coq,ejgallego/coq,coq/coq,JasonGross/coq,herbelin/github-coq,Lionel-Rieg/coq,aspiwack/coq,maximedenes/coq,TheTypoMaster/coq,TheTypoMaster/coq,pirbo/coq,SkySkimmer/coq,Ptival/coq,TheTypoMaster/coq,ale-f/coq,TOSPIO/coq,SkySkimmer/coq,ppedrot/coq,ppedrot/coq,aspiwack/coq,letouzey/coq-wip,shindere/coq,ejgallego/coq,asr/coq,letouzey/coq-wip,SkySkimmer/coq,silene/coq,gares/coq,jhjourdan/coq,barras/coq,TOSPIO/coq,ejgallego/coq,gmalecha/coq,jpdeplaix/coq,ale-f/coq,Matafou/coq,ale-f/coq,jpdeplaix/coq,Zimmi48/coq,TOSPIO/coq,gares/coq,ppedrot/coq,coq/coq,8l/coq,pirbo/coq,jhjourdan/coq,8l/coq,jpdeplaix/coq,JasonGross/coq,mattam82/coq,maximedenes/coq,amintimany/coq,Matafou/coq,Zimmi48/coq,asr/coq,JasonGross/coq,mlasson/coq,mattam82/coq,barras/coq,pirapira/coq2rust,gares/coq,maximedenes/coq,mlasson/coq,gmalecha/coq,Ptival/coq,ppedrot/coq,pirbo/coq,shindere/coq,maximedenes/coq