created WhenAllElseFails tips and trick

Author: stephengaito

docs/TipsAndTricks/WhenAllElseFails.md

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+# When all else fails...
+
+When all else fails... make a guess and then hack either 
+the poppler source code or the pdf2htmlEX source code (or both).
+
+Progressively add printf statements to record the different paths
+taken during a run of the pdf2htmlEX command.
+
+Typically these printf statements will announce the entry and exit
+of important methods. They will also typically record the values
+of various important variables (including values of the formal
+parameters).
+
+Eventually you should see what assumptions you or pdf2htmlEX are
+making that are not correct...
+
+It is then obvious (says he) what needs to be fixed...
+
+Given you are working directly on the source code on the
+AWS EC2 machine.... it is easy to get rid of the printfs...
+just throw the AWS EC2 machine away and start again.... :-)