Revise enum namings

[termoshtt]

Old	New
UVTFlag	JobSvd
UVTFlag::Full	JobSvd::All
FlagSVD	JobSvd (integrated)
EigenVectorFlag	JobEv
EigenVectorFlag::Calc	JobEv::All
EigenVectorFlag::Not	JobEv::None

• These definitions are moved into lax::flags submodule
• Note that JobSvd is also exposed in ndarray-linalg crate

[codecov]

Codecov Report

Merging #331 (86c61c3) into master (08aae3b) will decrease coverage by 0.04%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
- Coverage   89.97%   89.92%   -0.05%     
==========================================
  Files          71       72       +1     
  Lines        3911     3912       +1     
==========================================
- Hits         3519     3518       -1     
- Misses        392      394       +2     

Impacted Files	Coverage Δ
lax/src/lib.rs	90.90% <ø> (-5.97%)	⬇️
lax/src/triangular.rs	100.00% <ø> (ø)
lax/src/svd.rs	96.07% <80.00%> (-3.93%)	⬇️
ndarray-linalg/tests/svddc.rs	94.87% <90.00%> (ø)
lax/src/eig.rs	100.00% <100.00%> (ø)
lax/src/eigh.rs	95.00% <100.00%> (ø)
lax/src/flags.rs	100.00% <100.00%> (ø)
lax/src/svddc.rs	100.00% <100.00%> (ø)
ndarray-linalg/src/svddc.rs	90.47% <100.00%> (ø)

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