modflowpy / flopy / 2128

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Pull #710

travis-ci

refactor(mfsfr2): format floats as '{:.8g}' with older NumPy versions

* SFR2 files are written more similar between NumPy versions
* Formatting float32 prior to NumPy 1.14.0 was inconsistent, so
  force 8 decimal digits of precision with older versions
* Modern NumPy versions still use '{!s}' and should not see any difference
* Use global 'default_float_format' for various 'float_format' arguments
* Format integers as decimals '{:d}' instead of rounded floats '{:.0f}'
* Simplify _fmt_string, which no longer adds a space at the end
* Raise ValueError instead of bare Exception

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