#13 Improve const-correctness

[Markus Elfring]

Would you like to apply the advices from the article "http://en.wikipedia.org/wiki/Const-correctness" to more places in your sources?
I suggest to add the key word "const" to the type specifiers for parameters like the following.

• http://wifiscanner.svn.sourceforge.net/viewvc/wifiscanner/trunk/daily/src/airjack.h?revision=144&view=markup
  devname (functions "...AIRJACK")

• http://wifiscanner.svn.sourceforge.net/viewvc/wifiscanner/trunk/daily/src/analyse.h?revision=145&view=markup
  filename (function "LogWriteDOT")

[Markus Elfring]

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How do you think about the suggested API polish?