improve javascript

[thet]

• Scan and init row ui after inserting the row into the DOM tree. Should prevent JS initialization errors. [thet]

• When creating rows clone the row without any attached event handlers. [thet]

• Set auto-append UI state only for auto-append mode. [thet]

• Merge member-only JavaScript with logged-in bundle, not default bundle. [thet]

• Remove unused init_field.js script. [thet]

[codecov-commenter]

Codecov Report

Merging #118 (52accaf) into master (86ba5cb) will decrease coverage by 0.07%. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
- Coverage   73.80%   73.73%   -0.08%     
==========================================
  Files          12       12              
  Lines         668      670       +2     
==========================================
+ Hits          493      494       +1     
- Misses        175      176       +1     

Impacted Files	Coverage Δ
.../collective/z3cform/datagridfield/setuphandlers.py	75.00% <33.33%> (-8.34%)	:arrow_down:

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