Added options for X and Y error bars

AUTHORS

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+Authors of g3data
+See also the ChangeLog
+
+Jonas Frantz <jonas.frantz(at)welho.com>  designed and implemented g3data
+
+Principal Skinner:
+  entire files  bob1.cc, bob2.cc, bob3.cc
+  extensive changes in foo1.cc, foo2.cc, foo3.cc
+
+

ChangeLog

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+2014-05-04  Whitney Armstrong    <[email protected]>
+
+    * g3data/main.c : Added error bar options to gui.
+    If x and/or y error bars are selected, the cursor draws symmetric errors
+    just after the data point is created. Thus, clicking again defines the errors.
+
+    * g3data/main.c : Added optional asymmetric error bars.
+    If the error bars are selected to be asymmetric, only the first half is defined
+    by the second click. A third click completely defines the error bars.
+    Note that with logarithmic axes and error bars, the error bars are automatically 
+    assumed to be asymmetric. 
+
+    * g3data/points.c : Added printing of errors depending on how many and the type 
+    of errors defined.
+
+    * g3data/drawing.c (DrawErrorBar) : Added function to draw error bar.
+
+    * g3data/strings.h : Added some labels for errors and changed "Include errors" 
+    to "Include digitization errors" in order to distinguish them from error bars.
+
+    * AUTHORS : Added some authors
+