Rename hasOrphans and isFullyConnected to isConnected

[Affie]

close #325

[codecov]

Codecov Report

Merging #427 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #427      +/-   ##
==========================================
- Coverage   85.90%   85.89%   -0.01%     
==========================================
  Files          36       36              
  Lines        1951     1950       -1     
==========================================
- Hits         1676     1675       -1     
  Misses        275      275              

Impacted Files	Coverage Δ
src/CloudGraphsDFG/services/CloudGraphsDFG.jl	87.25% <ø> (ø)
src/Deprecated.jl	67.01% <ø> (ø)
src/DistributedFactorGraphs.jl	100.00% <ø> (ø)
src/GraphsDFG/GraphsDFG.jl	100.00% <ø> (ø)
src/GraphsDFG/services/GraphsDFG.jl	93.85% <ø> (ø)
src/LightDFG/LightDFG.jl	100.00% <ø> (ø)
src/LightDFG/services/LightDFG.jl	90.83% <100.00%> (ø)
src/services/AbstractDFG.jl	95.05% <100.00%> (-0.02%)	⬇️

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[dehann]

Looks good thanks