Detailed IPOPT Log in ipopt_v2

[mrmundt]

Fixes #548, #728 , IDAES/idaes-pse#92

Summary/Motivation:

There is a utility wrapper in parmest that gathers helpful data from the IPOPT log that has never been promoted to a "real world citizen." This PR replaces the need for that in ipopt_v2 by parsing the output and storing important data by default on the Results object.

NOTE: This PR contains #3576 so that one needs to be merged first.

Changes proposed in this PR:

• Update IPOPT parsing logic to capture iterations, various final scaled/unscaled results, the full solver log, etc.
• Update tests to ensure that we are actually capturing the output
• Fix a really sneaky bug that only appeared on older Python versions in Windows that stopped output from being captured

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