Fixes #1202: Now 10000x items is the limit before being converted to next bigger unit

Added a new method to display a number in a long fashion.
Added respective unit tests for them

src/main/java/appeng/client/render/AppEngRenderItem.java

@@ -129,7 +129,7 @@ public class AppEngRenderItem extends RenderItem
 		}
 		else
 		{
-			return NUMBER_CONVERTER.toHumanReadableForm( originalSize );
+			return NUMBER_CONVERTER.toLongHumanReadableForm( originalSize );
 		}
 	}
 }

src/main/java/appeng/util/ReadableNumberConverter.java

@@ -49,7 +49,7 @@ public enum ReadableNumberConverter
 		final long absNumber = Math.abs( number );
 
 		if( absNumber < DIVISION_BASE )
-			return Long.toString( absNumber );
+			return Long.toString( number );
 
 		final int exp = (int) ( Math.log( absNumber ) / LOG_DIVISION_BASE );
 		final char postFix = ENCODED_POSTFIXES[exp - 1];
@@ -93,7 +93,7 @@ public enum ReadableNumberConverter
 		final long absNumber = Math.abs( number );
 
 		if( absNumber < DIVISION_BASE )
-			return Long.toString( absNumber );
+			return Long.toString( number );
 
 		final int exp = (int) ( Math.log( absNumber ) / LOG_DIVISION_BASE );
 		final int result = (int) ( absNumber / Math.pow( DIVISION_BASE, exp ) );
@@ -111,4 +111,31 @@ public enum ReadableNumberConverter
 			return String.format( "%s%d%s", sign, result, postFix );
 		}
 	}
+
+	/**
+	 * Converts a number into a human readable form. It will not round the number, but floor it.
+	 * Will try to cut the number down 1 decimal later.
+	 *
+	 * Example:
+	 * 10000L -> 10K
+	 * 9999L -> 9999
+	 *
+	 * @param number to be converted number
+	 *
+	 * @return String in SI format cut down as far as possible
+	 */
+	public String toLongHumanReadableForm( long number )
+	{
+		final String sign = this.getSign( number );
+		final long absNumber = Math.abs( number );
+
+		if( absNumber < 10 * DIVISION_BASE )
+			return Long.toString( number );
+
+		final int exp = (int) ( Math.log( absNumber / 10 ) / LOG_DIVISION_BASE );
+		final int result = (int) ( absNumber / Math.pow( DIVISION_BASE, exp ) );
+		final char postFix = ENCODED_POSTFIXES[exp - 1];
+
+		return String.format( "%s%d%s", sign, result, postFix );
+	}
 }