Relative paths are relative to current directory not executable.

Almost nothing should be relative to the executable directory.
Content coming from the user should be relative to where the user
is (its working directory).

Fixes #70.

src/server/kiwix-serve.cpp

@@ -920,9 +920,7 @@ int main(int argc, char** argv)
         try {
           string libraryPath
               = isRelativePath(*itr)
-                    ? computeAbsolutePath(removeLastPathElement(
-                                              getExecutablePath(), true, false),
-                                          *itr)
+                    ? computeAbsolutePath(getCurrentDirectory(), *itr)
                     : *itr;
           retVal = libraryManager.readFile(libraryPath, true);
         } catch (...) {