Remove unnecessary use of OUString constructor in + expressions

Convert code like
  aFilename =  OUString::number(nFilePostfixCount) + OUString(".bmp");
to
  aFilename =  OUString::number(nFilePostfixCount) + ".bmp";

Change-Id: I03f513ad1c8ec8846b2afbdc67ab12525ed07e50
remove unnecessary double calls to OUString constructor

Change-Id: Ib2690e3ec9987b97363687b61fe8ddae4ace9058
Remove unnecessary use of OUString constructor in OUStringBuffer::append calls

Convert code like
  aStrBuffer.append(OUString(" AS "));
to
  aStrBuffer.append(" AS ");

Change-Id: I8c1884b5a875f40f0b5e511b6ef38c6c8eeee656
Unnecessary use of OUString constructor inside OUStringBuffer constructor

Convert code like:
    OUStringBuffer sVal(OUString("0x"));
to:
    OUStringBuffer sVal("0x");

Change-Id: Idc5a3f6a8bf1dc33f93c2b488f866c8ea58d582a