Fix some issues with @save and @load

[Thuener]

fix #253

[aramirezreyes]

"@save" and "@load" still fail 15 month later. Could someone with the powers take a look at this and suggest some improvement that makes it ready to merge?

[JeffBezanson]

Instead of using Main, this should use the hidden argument __module__ in the macro, which will give the calling context.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@cc660ae). Click here to learn what that means.
The diff coverage is 50.00%.

@@            Coverage Diff            @@
##             master     #254   +/-   ##
=========================================
  Coverage          ?   71.46%           
=========================================
  Files             ?        4           
  Lines             ?     1710           
  Branches          ?        0           
=========================================
  Hits              ?     1222           
  Misses            ?      488           
  Partials          ?        0           

Impacted Files	Coverage Δ
src/JLD.jl	90.05% <50.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cc660ae...b6204cf. Read the comment docs.

[avigliotti]

I am having the same error