Tweak ncon and network & Fix failed tests

[j9263178]

1. ncon() now utilizing the Network.construct() to pass the argument more directly.
2. Update Network.construct().
3. Update ncon and tests.
4. Update network tests, add the reuse scenario.
5. Fix BkUt_Svd_truncate1 and Gesvd.none_isU_isVT tests. (#237)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (dev-master@543ac20). Click here to learn what that means.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             dev-master     #257   +/-   ##
=============================================
  Coverage              ?   13.58%           
=============================================
  Files                 ?      276           
  Lines                 ?    54898           
  Branches              ?    24564           
=============================================
  Hits                  ?     7457           
  Misses                ?    41630           
  Partials              ?     5811           

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more