resolve bordered frame issue by providing a new switch 'c';

optimize memory;
shorten the 'directly' switch name

Author: hwding

README.md

@@ -39,7 +39,7 @@ Options:
    -r,  --recursive         process files in the given dir recursively
    -s,  --strict            use strict mode, a text area is considered as watermark
                             only if its content strictly equals one of the keywords
-   -c,  --clear             clear all annotations of the page which contains the target
+   -c,  --clear             clear all annotations in pages which contains the target
                             textual watermark(s), if you encounter bordered frame issues,
                             enable this switch
 ```

src/com/amastigote/unstamper/log/GeneralLogger.java

@@ -22,7 +22,7 @@ public static class Help {
                         "\n   -r,  --recursive         process files in the given dir recursively" +
                         "\n   -s,  --strict            use strict mode, a text area is considered as watermark\n" +
                         "                            only if its content strictly equals one of the keywords" +
-                        "\n   -c,  --clear             clear all annotations of the page which contains the target\n" +
+                        "\n   -c,  --clear             clear all annotations in pages which contains the target\n" +
                         "                            textual watermark(s), if you encounter bordered frame issues,\n" +
                         "                            enable this switch";