double.MaxValue cannot be parsed from string

[pfleck]

When using a DoubleArray, DoubleMatrix or DoubleRange and a value equals double.MaxValue the views cannot parse the string-representation back to double. This blocks the view because the invalid value have to be changed.

The problem occurs because the ToString of double rounds the double to a value which does not fit into double anymore. (see ​http://stackoverflow.com/questions/766918/convert-1-79769313486232e308-to-double-without-overflowexception)

To fix this, the ToString should be used with the format string "R" or "G17", like it is done in the DoubleValue. This guarantees that converting the double to string and parsing it back yields the same double value. (see ​https://msdn.microsoft.com/en-us/library/kfsatb94.aspx)

[pfleck]

r12431 Fixed parsing issues by using the G17 format.

[pfleck]

r12432 Use simple round-trip format for doubles because G17 prints some strange numbers (20.22 to 20.219999999999999999). Some accuracy can still be lost on 64bit machines, but should be very rare and minimal. double.MaxValue can still be parsed correctly, solving the problem of invalid value for the GUI.

[mkommend]

r12433: Minor change in DoubleValue.GetValue.

[mkommend]

r12705: Merged r12431, r12432, r12433 into stable.