Minor tweaks for 2.6 beta

[ischoegl]

Changes proposed in this pull request

• Discontinue mole in favor of molar in basis keywords
• Mark some derivatives as 'experimental', while PR Adding adaptive preconditioner functionality to Cantera #1010 and discussions in Reconsider composition state variables for reactors, flames, and other systems enhancements#91 are not fully resolved

If applicable, fill in the issue number this pull request is fixing

N/A

If applicable, provide an example illustrating new features this pull request is introducing

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[ischoegl]

@speth / @bryanwweber ... I removed the molar/mole changes.

[codecov]

Codecov Report

Merging #1212 (67f5b44) into main (8cdcef1) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    Cantera/cantera#1212      +/-   ##
==========================================
+ Coverage   65.38%   65.42%   +0.04%     
==========================================
  Files         318      320       +2     
  Lines       46095    46247     +152     
  Branches    19604    19655      +51     
==========================================
+ Hits        30139    30259     +120     
- Misses      13442    13460      +18     
- Partials     2514     2528      +14     

Impacted Files	Coverage Δ
include/cantera/kinetics/Kinetics.h	36.52% <ø> (ø)
include/cantera/kinetics/RateCoeffMgr.h	85.71% <0.00%> (-14.29%)	⬇️
include/cantera/kinetics/ReactionData.h	88.88% <0.00%> (-4.87%)	⬇️
src/kinetics/Kinetics.cpp	68.80% <0.00%> (-3.67%)	⬇️
src/kinetics/InterfaceKinetics.cpp	75.79% <0.00%> (-3.17%)	⬇️
src/kinetics/ReactionFactory.cpp	89.89% <0.00%> (-0.16%)	⬇️
include/cantera/kinetics/Reaction.h	100.00% <0.00%> (ø)
include/cantera/kinetics/InterfaceKinetics.h	85.71% <0.00%> (ø)
include/cantera/kinetics/InterfaceRate.h	84.14% <0.00%> (ø)
src/kinetics/InterfaceRate.cpp	91.81% <0.00%> (ø)
... and 11 more

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[speth]

Looks good to me.