preliminary whitespace cleanup

CRM/Contribute/BAO/Premium.php

CRM/Contribute/Form/Contribution/Main.php

CRM/Contribute/Form/ContributionPage/AddProduct.php

CRM/Contribute/Form/ContributionPage/Amount.php

CRM/Contribute/Form/ContributionPage/Custom.php

CRM/Contribute/Form/ManagePremiums.php

CRM/Contribute/Form/Task.php

CRM/Contribute/Form/Task/Batch.php

CRM/Contribute/Form/Task/Delete.php

CRM/Contribute/Form/Task/PDF.php

CRM/Contribute/Form/Task/PDFLetterCommon.php

CRM/Contribute/Form/Task/PickProfile.php

CRM/Contribute/Form/Task/SearchTaskHookSample.php

CRM/Contribute/Form/Task/Status.php

CRM/Contribute/Info.php

CRM/Contribute/Page/ContributionPage.php