Put back some deprecated for a bit longer and backward compat for loadDFG

[Affie]

should close #618

[codecov]

Codecov Report

Merging #620 into master will decrease coverage by 0.74%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #620      +/-   ##
==========================================
- Coverage   80.28%   79.54%   -0.75%     
==========================================
  Files          33       33              
  Lines        2196     2219      +23     
==========================================
+ Hits         1763     1765       +2     
- Misses        433      454      +21     

Impacted Files	Coverage Δ
src/Deprecated.jl	0.00% <0.00%> (ø)
src/services/Serialization.jl	73.24% <100.00%> (+0.17%)	⬆️
src/DataBlobs/services/BlobStores.jl	76.31% <0.00%> (-3.38%)	⬇️
src/CloudGraphsDFG/services/CGStructure.jl	60.00% <0.00%> (-2.61%)	⬇️
src/CloudGraphsDFG/services/CloudGraphsDFG.jl	69.05% <0.00%> (-1.39%)	⬇️
src/services/AbstractDFG.jl	84.87% <0.00%> (-0.75%)	⬇️

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